Annual report pursuant to Section 13 and 15(d)

Long-term Debt - Other Debt (Details)

v3.19.3.a.u2
Long-term Debt - Other Debt (Details)
Jun. 22, 2017
USD ($)
Jun. 12, 2017
EUR (€)
tranche
Dec. 29, 2016
USD ($)
May 17, 2016
USD ($)
Oct. 24, 2013
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
JPY (¥)
Dec. 31, 2018
USD ($)
May 04, 2016
USD ($)
Debt Instrument [Line Items]                  
Debt covenant, net debt to EBITDA ratio, first three years           3 3    
Debt covenant, net debt to EBITDA ratio, after three years           2.5 2.5    
Foreign debt                  
Debt Instrument [Line Items]                  
Notes payable           $ 2,387,000   $ 2,358,000  
Maximum borrowing capacity           2,358,000 ¥ 260,000,000    
October 2013 NMTC Agreement | Chase                  
Debt Instrument [Line Items]                  
Proceeds from contributions from affiliates         $ 6,634,000        
October 2013 NMTC Agreement | Potters Industries, LLC                  
Debt Instrument [Line Items]                  
Proceeds from contributions from affiliates         15,632,000        
Notes payable         21,000,000 21,000,000      
October 2013 NMTC Agreement | Potters Industries, LLC | Note payable I                  
Debt Instrument [Line Items]                  
Notes payable         5,368,000        
October 2013 NMTC Agreement | Potters Industries, LLC | Notes payable II                  
Debt Instrument [Line Items]                  
Notes payable         $ 15,632,000        
May 2016 NMTC Agreement | Potters Industries, LLC                  
Debt Instrument [Line Items]                  
Proceeds from contributions from affiliates       $ 7,822,000          
Notes payable       11,000,000   11,000,000      
May 2016 NMTC Agreement | Potters Industries, LLC | Note payable I                  
Debt Instrument [Line Items]                  
Notes payable       7,823,000          
May 2016 NMTC Agreement | Potters Industries, LLC | Notes payable II                  
Debt Instrument [Line Items]                  
Notes payable       1,311,000          
May 2016 NMTC Agreement | Potters Industries, LLC | Notes payable III                  
Debt Instrument [Line Items]                  
Notes payable       1,866,000          
May 2016 NMTC Agreement | USB Investment Fund                  
Debt Instrument [Line Items]                  
Proceeds from contributions from affiliates       $ 3,732,000          
Debt instrument, term       7 years          
December 2016 NMTC Agreement | Potters Industries, LLC                  
Debt Instrument [Line Items]                  
Proceeds from contributions from affiliates     $ 7,775,000            
Notes payable     11,000,000     11,000,000      
December 2016 NMTC Agreement | Potters Industries, LLC | Note payable I                  
Debt Instrument [Line Items]                  
Notes payable     7,775,000            
December 2016 NMTC Agreement | Potters Industries, LLC | Notes payable II                  
Debt Instrument [Line Items]                  
Notes payable     1,402,000            
December 2016 NMTC Agreement | Potters Industries, LLC | Notes payable III                  
Debt Instrument [Line Items]                  
Notes payable     1,823,000            
December 2016 NMTC Agreement | USB Investment Fund                  
Debt Instrument [Line Items]                  
Proceeds from contributions from affiliates     $ 3,815,000            
June 2017 NMTC Agreement | Potters Industries, LLC                  
Debt Instrument [Line Items]                  
Notes payable $ 8,820,000         8,820,000      
Maximum indemnification liability           $ 24,649,000      
June 2017 NMTC Agreement | USB Investment Fund                  
Debt Instrument [Line Items]                  
Proceeds from contributions from affiliates 3,054,000                
Notes payable 6,221,000                
June 2017 NMTC Agreement | Community Reinvestment Fund, Inc.                  
Debt Instrument [Line Items]                  
Proceeds from contributions from affiliates $ 9,000,000                
Debt instrument, term 7 years                
Sovitec debt                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity                 $ 200,000,000
Sovitec debt | Belfius Bank NV                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity | €   € 14,500,000              
Number of tranches | tranche   4              
Sovitec debt | Euro Roll-over Line of Credit Maturing December 2021 | Belfius Bank NV                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity | €   € 7,500,000              
Periodic principal payment | €   € 750,000              
Debt instrument stated interest rate           1.10% 1.10%    
Line of credit outstanding           $ 3,361,000      
Sovitec debt | Euro Roll-over Line of Credit Maturing December 2021 | Belfius Bank NV | EURIBOR | Minimum                  
Debt Instrument [Line Items]                  
Variable rate on spread   1.10%              
Sovitec debt | Euro Roll-over Line of Credit Maturing December 2021 | Belfius Bank NV | EURIBOR | Maximum                  
Debt Instrument [Line Items]                  
Variable rate on spread   1.55%              
Sovitec debt | Euro Roll-over Line of Credit Maturing September 2022 | Belfius Bank NV                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity | €   € 3,000,000              
Debt instrument stated interest rate           1.85% 1.85%    
Line of credit outstanding           $ 3,361,000      
Sovitec debt | Euro Roll-over Line of Credit Maturing September 2022 | Belfius Bank NV | EURIBOR | Minimum                  
Debt Instrument [Line Items]                  
Variable rate on spread   1.85%              
Sovitec debt | Euro Roll-over Line of Credit Maturing September 2022 | Belfius Bank NV | EURIBOR | Maximum                  
Debt Instrument [Line Items]                  
Variable rate on spread   2.15%              
Sovitec debt | Working Capital | Belfius Bank NV                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity | €   € 3,000,000              
Debt instrument stated interest rate           0.90% 0.90%    
Line of credit outstanding           $ 2,576,000      
Sovitec debt | Working Capital | Belfius Bank NV | EURIBOR | Minimum                  
Debt Instrument [Line Items]                  
Variable rate on spread   0.90%              
Sovitec debt | Working Capital | Belfius Bank NV | EURIBOR | Maximum                  
Debt Instrument [Line Items]                  
Variable rate on spread   1.20%              
Sovitec debt | CAPEX Line | Belfius Bank NV                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity | €   € 1,000,000              
Debt instrument stated interest rate           1.25% 1.25%    
Line of credit outstanding           $ 1,120,000      
Sovitec debt | CAPEX Line | Belfius Bank NV | EURIBOR | Minimum                  
Debt Instrument [Line Items]                  
Variable rate on spread   1.25%              
Sovitec debt | CAPEX Line | Belfius Bank NV | EURIBOR | Maximum                  
Debt Instrument [Line Items]                  
Variable rate on spread   1.80%              
Term Loan And Senior Notes                  
Debt Instrument [Line Items]                  
Fair value of debt           $ 1,905,822,000   $ 2,010,023,000