Long-Term Debt and Credit Facility (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Long-term debt:
Long-term debt	$ 61,235	$ 50,546
Less current portion of long-term debt	(44,765)	(32,291)
Long-term debt, less current portion	16,470	18,255
Revolving Credit Facility [Member]
Long-term debt:
Long-term debt	37,622	25,148
Term loan [Member]
Long-term debt:
Long-term debt	$ 23,613	$ 25,398