Annual report pursuant to Section 13 and 15(d)

Accumulated Other Comprehensive Income (Loss) - Change by Component (Details)

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Accumulated Other Comprehensive Income (Loss) - Change by Component (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax    
Beginning balance $ 1,659,560  
Ending balance 1,779,450 $ 1,659,560
Total    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax    
Beginning balance (39,104) 4,311
Other comprehensive loss before reclassifications 21,226 (43,258)
Amounts reclassified from accumulated other comprehensive income 656 (157)
Total other comprehensive income (loss) 21,882 (43,415)
Tax Cuts and Jobs Act, reclassification from AOCI to retained earnings, tax effect 1,874  
Ending balance (15,348) (39,104)
Defined benefit and other postretirement plans    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax    
Beginning balance (546) 7,412
Other comprehensive loss before reclassifications 2,497 (7,874)
Amounts reclassified from accumulated other comprehensive income (67) (84)
Total other comprehensive income (loss) 2,430 (7,958)
Tax Cuts and Jobs Act, reclassification from AOCI to retained earnings, tax effect 1,684  
Ending balance 3,568 (546)
Net gain (loss) from hedging activities    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax    
Beginning balance 637 967
Other comprehensive loss before reclassifications (3,388) (257)
Amounts reclassified from accumulated other comprehensive income 723 (73)
Total other comprehensive income (loss) (2,665) (330)
Tax Cuts and Jobs Act, reclassification from AOCI to retained earnings, tax effect 190  
Ending balance (1,838) 637
Foreign currency translation    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax    
Beginning balance (39,195) (4,068)
Other comprehensive loss before reclassifications 22,117 (35,127)
Amounts reclassified from accumulated other comprehensive income 0 0
Total other comprehensive income (loss) 22,117 (35,127)
Tax Cuts and Jobs Act, reclassification from AOCI to retained earnings, tax effect 0  
Ending balance $ (17,078) $ (39,195)