Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments - Fair Value (Details)

v3.19.3
Financial Instruments - Fair Value (Details) - Derivatives designated as hedging instrument - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Derivative assets:    
Total derivative assets $ 40,125 $ 20,768
Derivative liabilities:    
Total derivative liabilities 4,130 2,026
Cash flow hedging    
Derivative assets:    
Total derivative assets 0 1,925
Cash flow hedging | Prepaid and other current assets | Natural gas swaps    
Derivative assets:    
Total derivative assets 0 21
Cash flow hedging | Prepaid and other current assets | Interest rate caps    
Derivative assets:    
Total derivative assets 0 1,358
Cash flow hedging | Other long-term assets | Interest rate caps    
Derivative assets:    
Total derivative assets 0 546
Cash flow hedging | Accrued liabilities | Natural gas swaps    
Derivative liabilities:    
Total derivative liabilities 626 36
Cash flow hedging | Other long-term liabilities | Natural gas swaps    
Derivative liabilities:    
Total derivative liabilities 302 148
Cash flow hedging | Other long-term liabilities | Interest rate caps    
Derivative liabilities:    
Total derivative liabilities 3,202 1,842
Net investment hedging    
Derivative assets:    
Total derivative assets 40,125 18,843
Net investment hedging | Prepaid and other current assets | Cross-currency interest rate swaps    
Derivative assets:    
Total derivative assets 7,517 5,499
Net investment hedging | Other long-term assets | Cross-currency interest rate swaps    
Derivative assets:    
Total derivative assets $ 32,608 $ 13,344