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Reclassifications Out of Accumulated Other Comprehensive Loss (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 [Roll Forward]        
Balance at beginning of period     $ 602,578  
Total amount reclassified from Accumulated other comprehensive loss, net of tax $ (774) $ 0 (774) $ 0
Other comprehensive income (loss) (25,595) 16,280 (9,866) 29,008
Balance at end of period 639,070   639,070  
Accumulated Defined Benefit Plans Adjustment Attributable to Parent        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of period (95,619) (116,084) (97,948) (118,068)
Tax benefit (614) (935) (1,682) (2,043)
Total amount reclassified from Accumulated other comprehensive loss, net of tax 3,059 2,157 5,388 4,141
Balance at end of period (92,560) (113,927) (92,560) (113,927)
Accumulated Defined Benefit Plans Adjustment Attributable to Noncontrolling Interest        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of period 0 0 0 0
Tax benefit 0 0 0 0
Total amount reclassified from Accumulated other comprehensive loss, net of tax 0 0 0 0
Balance at end of period 0 0 0 0
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Amounts reclassified from Accumulated other comprehensive loss (131) (109) (213) (218)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Noncontrolling Interest        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Amounts reclassified from Accumulated other comprehensive loss 0 0 0 0
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Amounts reclassified from Accumulated other comprehensive loss 3,804 3,201 7,283 6,402
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Noncontrolling Interest        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Amounts reclassified from Accumulated other comprehensive loss 0 0 0 0
Accumulated Foreign Currency Adjustment Attributable to Parent        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of period (60,584) (100,808) (73,814) (112,178)
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent 774 0 (774) 0
Other comprehensive income (loss) (27,607) 14,960 (14,377) 26,330
Balance at end of period (88,965) (85,848) (88,965) (85,848)
Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of period 971 (2,590) 801 (1,964)
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent 0 0 0 0
Other comprehensive income (loss) (273) (837) (103) (1,463)
Balance at end of period $ 698 $ (3,427) $ 698 $ (3,427)