Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Components of AOCI (Details)

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Stockholders' Equity - Components of AOCI (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax        
Stockholders equity $ 1,277,179 $ 1,785,318 $ 1,664,145 $ 1,631,919
Accumulated other comprehensive income (loss)        
Accumulated Other Comprehensive Income (Loss), Net of Tax        
Stockholders equity (15,265) (15,348) $ (39,104) $ 4,311
Defined benefit and other postretirement plans        
Accumulated Other Comprehensive Income (Loss), Net of Tax        
Stockholders equity 5,278 3,568    
Tax        
Tax related to AOCI (1,649) (994)    
Net gain (loss) from hedging activities        
Accumulated Other Comprehensive Income (Loss), Net of Tax        
Stockholders equity (660) (1,838)    
Tax        
Tax related to AOCI 549 604    
Foreign currency translation        
Accumulated Other Comprehensive Income (Loss), Net of Tax        
Stockholders equity (19,883) (17,078)    
Tax        
Tax related to AOCI $ 1,223 $ 7,474