Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI Beginning balance			$ (8,801)
AOCI Ending balance	$ (5,321)		(5,321)
Balance at			(1,080)
Balance at	(1,031)		(1,031)
Balance at			(7,721)
Other comprehensive income (loss), net of tax	1,608	$ (94)	3,431	$ 10,811
Balance at	(4,290)		(4,290)
Accumulated Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI Beginning balance			(5,848)
Other comprehensive income adjustments			3,351
AOCI Ending balance	(2,497)		(2,497)
Other comprehensive income (loss), net of tax			3,351
Accumulated Defined Benefit Plans Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other comprehensive income adjustments			129
Other comprehensive income (loss), tax			49
Other comprehensive income (loss), net of tax			80
Minimum Pension Liability Adjustment | Accumulated Defined Benefit Plans Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI Beginning balance			197
Other comprehensive income adjustments			(13)
AOCI Ending balance	184		184
Postretirement Health Coverage | Accumulated Defined Benefit Plans Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI Beginning balance			(3,150)
Other comprehensive income adjustments			142
AOCI Ending balance	$ (3,008)		$ (3,008)