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Reclassifications Out of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jan. 01, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Balance at beginning of period     $ 639,519    
Total amount reclassified from Accumulated other comprehensive loss, net of tax $ (212) $ 0 15,147 $ (774)  
Other comprehensive income (loss) (14,055) (2,104) 5,244 (11,970)  
Balance at end of period 708,305   708,305    
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 (115,888) (92,560) (115,517) (97,948)  
Tax benefit (468) (886) (2,518) (2,566)  
Total amount reclassified from Accumulated other comprehensive loss, net of tax 2,257 2,651 5,658 8,039  
Balance at end of period (113,631) (89,909) (113,631) (89,909)  
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 (47) (105) (141) (319)  
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 2,772 3,642 8,317 10,924  
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 Other Comprehensive Loss          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Reclassification due to the adoption of ASU 2018-02 (3,772)   (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 (9) 0 (572) 0  
Other comprehensive income (loss) (9) 0 554 0  
Balance at end of period (18) 0 (18) 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 0 0  
Other comprehensive income (loss) 0 0 0 0  
Balance at end of period 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 (87,509) (88,965) (102,838) (73,814)  
Total amount reclassified from Accumulated other comprehensive loss, net of tax (212) 0 15,147 (774)  
Other comprehensive income (loss) (15,864) (4,561) (15,894) (18,938)  
Balance at end of period (103,585) (93,526) (103,585) (93,526)  
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 502 698 496 801  
Total amount reclassified from Accumulated other comprehensive loss, net of tax 0 0 0 0  
Other comprehensive income (loss) (227) (194) (221) (297)  
Balance at end of period 275 504 275 504  
Accounting Standards Update 2018-02 | Accumulated Other Comprehensive Loss          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Reclassification due to the adoption of ASU 2018-02 $ (3,772) $ 0 $ (3,772) $ 0 $ (3,800)