Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI before tax, beginning balance	$ (5,336)
Accumulated other comprehensive income, tax, beginning balance	(970)
Accumulated Other Comprehensive Income Beginning Balance	(4,366)
Cumulative effect of new accounting principle in period of adoption			$ 274
Other comprehensive income (loss), net of tax	(213)	$ 705
AOCI before tax, ending balance	(5,539)
Accumulated other comprehensive income, tax, ending balance	(960)
Accumulated Other Comprehensive Income Ending Balance	(4,579)
Accumulated Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI before tax, beginning balance	(2,698)
Other comprehensive income adjustments	110
Other comprehensive income (loss), net of tax	110
AOCI before tax, ending balance	(2,588)
Accumulated Defined Benefit Plans Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other comprehensive income adjustments	37
Other comprehensive income (loss), tax	10
Other comprehensive income (loss), net of tax	27
Minimum Pension Liability Adjustment | Accumulated Defined Benefit Plans Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI before tax, beginning balance	171
Other comprehensive income adjustments	(7)
AOCI before tax, ending balance	179
Postretirement Health Coverage | Accumulated Defined Benefit Plans Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI before tax, beginning balance	(2,809)
Other comprehensive income adjustments	44
AOCI before tax, ending balance	$ (3,130)
Accounting Standards Update 2014-09
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect of new accounting principle in period of adoption			(350)
Accounting Standards Update 2014-09 | Minimum Pension Liability Adjustment | Accumulated Defined Benefit Plans Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect of new accounting principle in period of adoption			15
Accounting Standards Update 2014-09 | Postretirement Health Coverage | Accumulated Defined Benefit Plans Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect of new accounting principle in period of adoption			$ (365)