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Reclassifications Out of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of period     $ 561,212  
Total amount reclassified from Accumulated other comprehensive loss, net of tax $ 0 $ 0 0 $ 4,125
Other comprehensive income (loss) 12,201 (518) 41,209 6,285
Balance at end of period 621,207   621,207  
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 (113,927) (115,603) (118,068) (119,389)
Tax benefit (1,009) (1,046) (3,052) (3,132)
Total amount reclassified from Accumulated other comprehensive loss, net of tax 2,180 1,893 6,321 5,679
Balance at end of period (111,747) (113,710) (111,747) (113,710)
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 (10) (88) (228) (268)
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 3,199 3,027 9,601 9,079
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 (85,848) (86,873) (112,178) (88,810)
Reclassification into earnings     0 3,355
Other comprehensive income (loss) 5,892 (2,596) 32,222 (4,014)
Balance at end of period (79,956) (89,469) (79,956) (89,469)
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 (3,427) (2,536) (1,964) (3,616)
Reclassification into earnings     0 770
Other comprehensive income (loss) 4,129 185 2,666 495
Balance at end of period $ 702 $ (2,351) $ 702 $ (2,351)