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Other Comprehensive Loss - After-tax Changes in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Foreign currency translation adjustment    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance $ (24,313) $ (21,079)
Net current period change 4,078 (408)
Reclassification adjustments for losses reclassified into income 0 0
Ending Balance (20,235) (21,487)
Pension and post-retirement benefits plans    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance (24,532) (18,575)
Reclassification adjustments for losses reclassified into income (1,284) (1,034)
Ending Balance (25,816) (19,609)
Accumulated other comprehensive loss    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance (48,845) (39,654)
Net current period change 4,078 (408)
Reclassification adjustments for losses reclassified into income (1,284) (1,034)
Ending Balance $ (46,051) $ (41,096)