Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Changes in accumulated other comprehensive income, net of tax
Balance at the beginning of period			$ (2,279)
Other comprehensive income and pension reclassification	$ 518	$ (430)	2,461	$ 645
Balance at the end of period	182		182
Foreign currency
Changes in accumulated other comprehensive income, net of tax
Balance at the beginning of period			(1,591)
Other comprehensive income and pension reclassification			2,404
Balance at the end of period	813		813
Defined benefit pension plan
Changes in accumulated other comprehensive income, net of tax
Balance at the beginning of period			(688)
Other comprehensive income and pension reclassification			57
Balance at the end of period	$ (631)		$ (631)