Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net income (loss)	$ 26,191	$ 23,675	$ (4,929)
Company sponsored benefit plans:
Change in translation adjustment and post-employment benefits of equity method investments, net of tax benefit of $36, $37, and $8, respectively	42	(15)	18
Other comprehensive income (loss)	232	(728)	229
Comprehensive income (loss)	26,423	22,947	(4,700)
Change in Pension Plans [Member]
Company sponsored benefit plans:
Change in pension plans and post employment benefits, net of tax expense	244	133	250
Change in Post-employment Benefits [Member]
Company sponsored benefit plans:
Change in pension plans and post employment benefits, net of tax expense	$ (54)	$ (846)	$ (39)