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, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax        
Stockholders equity $ 1,664,145 $ 1,631,919 $ 1,027,944 $ 235,293
Accumulated other comprehensive income (loss)        
Accumulated Other Comprehensive Income (Loss), Net of Tax        
Stockholders equity (39,104) 4,311 (53,711) $ 648
Defined benefit and other postretirement plans        
Accumulated Other Comprehensive Income (Loss), Net of Tax        
Stockholders equity (546) 7,412 7,513  
Tax        
Tax related to AOCI (2,362) (4,761)    
Net gain (loss) from hedging activities        
Accumulated Other Comprehensive Income (Loss), Net of Tax        
Stockholders equity 637 967 4,557  
Tax        
Tax related to AOCI (474) (584)    
Foreign currency translation        
Accumulated Other Comprehensive Income (Loss), Net of Tax        
Stockholders equity (39,195) (4,068) $ (65,781)  
Tax        
Tax related to AOCI $ 5,154 $ 790