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Reclassifications Out of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Balance at beginning of period $ 639,519  
Other comprehensive income (loss) 18,279 $ 15,729
Balance at end of period 663,285  
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 (115,517) (97,948)
Tax benefit (666) (1,066)
Total amount reclassified from Accumulated other comprehensive loss, net of tax 2,023 2,329
Balance at end of period (117,266) (95,619)
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
Tax benefit 0 0
Total amount reclassified from Accumulated other comprehensive loss, net of tax 0 0
Balance at end of period 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 (105) (83)
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
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 2,794 3,478
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
Accumulated Other Comprehensive (Loss)    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Cumulative effect of the adoption of new accounting pronouncements (3,772)  
Accumulated Net Investment Gain (Loss) Attributable to Parent    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Balance at beginning of period (572) 0
Other comprehensive income (loss) 536 0
Balance at end of period (36) 0
Accumulated Net Investment Gain (Loss) Attributable to Noncontrolling Interest    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Balance at beginning of period 0 0
Other comprehensive income (loss) 0 0
Balance at end of period 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 (102,838) (73,814)
Reclassification from accumulated other comprehensive loss into net income 15,359 0
Other comprehensive income (loss) 218 13,230
Balance at end of period (87,261) (60,584)
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 496 801
Reclassification from accumulated other comprehensive loss into net income 0 0
Other comprehensive income (loss) 143 170
Balance at end of period 639 $ 971
Accounting Standards Update 2018-02 | Accumulated Other Comprehensive (Loss)    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Cumulative effect of the adoption of new accounting pronouncements $ (3,772)