Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Changes in accumulated other comprehensive income, net of tax
Balance at the beginning of period	$ (2,279)
Other comprehensive income and pension reclassification	1,943	$ 1,075
Balance at the end of period	(336)
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	1,915
Balance at the end of period	324
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	28
Balance at the end of period	$ (660)