Annual report pursuant to Section 13 and 15(d)

Accumulated Other Comprehensive Income (Loss) - Components, Net of Tax (Details)

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Accumulated Other Comprehensive Income (Loss) - Components, Net of Tax (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax        
Stockholders equity $ 1,785,318 $ 1,664,145 $ 1,631,919 $ 1,027,944
Accumulated other comprehensive income (loss)        
Accumulated Other Comprehensive Income (Loss), Net of Tax        
Stockholders equity (15,348) (39,104) $ 4,311 $ (53,711)
Defined benefit and other postretirement plans        
Accumulated Other Comprehensive Income (Loss), Net of Tax        
Stockholders equity 3,568 (546)    
Tax        
Tax related to AOCI (1,216) (2,362)    
Net gain (loss) from hedging activities        
Accumulated Other Comprehensive Income (Loss), Net of Tax        
Stockholders equity (1,838) 637    
Tax        
Tax related to AOCI 604 (474)    
Foreign currency translation        
Accumulated Other Comprehensive Income (Loss), Net of Tax        
Stockholders equity (17,078) (39,195)    
Tax        
Tax related to AOCI $ 2,834 $ 5,154