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Reclassifications Out of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of period     $ 517,128  
Total amount reclassified from Accumulated other comprehensive loss, net of tax $ 0 $ 0 (4,125) $ 0
Other comprehensive income (loss) (518) (11,407) 6,285 (26,414)
Balance at end of period 566,933   566,933  
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 (115,603) (120,418) (119,389) (125,570)
Tax benefit (1,046) (1,267) (3,132) (4,161)
Total amount reclassified from Accumulated other comprehensive loss, net of tax (1,893) (2,294) (5,679) (7,446)
Balance at end of period (113,710) (118,124) (113,710) (118,124)
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 (88) (235) (268) (201)
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 3,027 3,796 9,079 11,808
Accumulated Foreign Currency Adjustment Attributable to Parent        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of period (86,873) (60,865) (88,810) (41,160)
Reclassification into earnings     3,355 0
Other comprehensive income (loss) (2,596) (13,131) (4,014) (32,836)
Balance at end of period (89,469) (73,996) (89,469) (73,996)
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 (2,536) (2,653) (3,616) (2,199)
Reclassification into earnings     770  
Other comprehensive income (loss) 185 (570) 495 (1,024)
Balance at end of period $ (2,351) $ (3,223) $ (2,351) $ (3,223)