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Reclassifications Out of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Balance at beginning of period $ 561,212  
Other comprehensive income (loss) 12,728 $ 15,840
Balance at end of period 578,278  
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 (118,068) (119,389)
Tax benefit (1,108) (1,044)
Total amount reclassified from Accumulated other comprehensive loss, net of tax 1,984 1,892
Balance at end of period (116,084) (117,497)
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
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 (109) (90)
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 3,201 3,026
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 Foreign Currency Adjustment Attributable to Parent    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Balance at beginning of period (112,178) (88,810)
Reclassification into earnings 0 2,103
Other comprehensive income (loss) 11,370 13,624
Balance at end of period (100,808) (73,083)
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 (1,964) (3,616)
Tax benefit 0 0
Reclassification into earnings 0 0
Other comprehensive income (loss) (626) 324
Balance at end of period $ (2,590) $ (3,292)