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, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax        
Stockholders equity $ 1,631,919 $ 1,027,944 $ 235,293 $ 217,824
Accumulated other comprehensive income (loss)        
Accumulated Other Comprehensive Income (Loss), Net of Tax        
Stockholders equity 4,311 (53,711) 648 $ 0
Defined benefit and other postretirement plans        
Accumulated Other Comprehensive Income (Loss), Net of Tax        
Stockholders equity 7,412 7,513 648  
Tax        
Tax related to AOCI (4,761) (4,799)    
Net gain (loss) from hedging activities        
Accumulated Other Comprehensive Income (Loss), Net of Tax        
Stockholders equity 967 4,557 0  
Tax        
Tax related to AOCI (584) (2,793)    
Foreign currency translation        
Accumulated Other Comprehensive Income (Loss), Net of Tax        
Stockholders equity (4,068) (65,781) $ 0  
Tax        
Tax related to AOCI $ 790 $ 6,627