Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash paid during the period for:
Income taxes, net	$ 476	$ 79
Interest, net	466	417
Non-Cash Transaction Information:
Employee stock purchase plan	192	152
Equipment acquired under capital leases	788	249
Capital Expenditures Incurred but Not yet Paid	$ 32	$ 53