Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Income - Change by Component (Details)

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Accumulated Other Comprehensive Income - Change by Component (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax        
Beginning balance     $ 1,631,919 $ 1,027,944
Amounts reclassified from accumulated other comprehensive income $ 102 $ (4) 93 (53)
Total other comprehensive income (loss) (27,565) 25,027 (16,729) 38,414
Ending balance 1,639,328 1,064,416 1,639,328 1,064,416
Total        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax        
Beginning balance     4,311 (53,711)
Other comprehensive income (loss) before reclassifications     (16,582) 37,966
Amounts reclassified from accumulated other comprehensive income     93 (53)
Total other comprehensive income (loss)     (16,489) 37,913
Ending balance (12,178) (15,798) (12,178) (15,798)
Defined benefit and other postretirement plans        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax        
Beginning balance     7,412 7,513
Other comprehensive income (loss) before reclassifications     1,387 (137)
Amounts reclassified from accumulated other comprehensive income (16) (33) (30) (66)
Total other comprehensive income (loss)     1,357 (203)
Ending balance 8,769 7,310 8,769 7,310
Net gain (loss) from hedging activities        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax        
Beginning balance     967 4,557
Other comprehensive income (loss) before reclassifications     2,613 (3,038)
Amounts reclassified from accumulated other comprehensive income     123 13
Total other comprehensive income (loss)     2,736 (3,025)
Ending balance 3,703 1,532 3,703 1,532
Foreign currency translation        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax        
Beginning balance     (4,068) (65,781)
Other comprehensive income (loss) before reclassifications     (20,582) 41,141
Amounts reclassified from accumulated other comprehensive income     0 0
Total other comprehensive income (loss)     (20,582) 41,141
Ending balance $ (24,650) $ (24,640) $ (24,650) $ (24,640)