Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI Beginning balance			$ (8,801)
AOCI Ending balance	$ (6,945)		(6,945)
Balance at			(1,080)
Balance at	(1,047)		(1,047)
Balance at			(7,721)
Other comprehensive income (loss), net of tax	1,118	$ 7,790	1,823	$ 10,905
Balance at	(5,898)		(5,898)
Accumulated Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI Beginning balance			(5,848)
Other comprehensive income adjustments			1,770
AOCI Ending balance	(4,078)		(4,078)
Other comprehensive income (loss), net of tax			1,770
Accumulated Defined Benefit Plans Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other comprehensive income adjustments			86
Other comprehensive income (loss), tax			33
Other comprehensive income (loss), net of tax			53
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			(9)
AOCI Ending balance	188		188
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			95
AOCI Ending balance	$ (3,055)		$ (3,055)