Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash paid during the period for:
Income taxes, net	$ 482	$ 476
Interest, net	678	466
Non-cash transaction information:
Employee stock purchase plan	127	192
Equipment acquired under capital leases	$ 441	$ 788