Long-Term Debt and Credit Facility (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Long-term debt:
Long-term debt	$ 52,159	$ 44,041
Less amount reported as current	(30,332)	(18,643)
Long-term debt, less current portion	21,827	25,398
Revolving Credit Facility [Member]
Long-term debt:
Long-term debt	23,189	8,500
Term loan [Member]
Long-term debt:
Long-term debt	$ 28,970	$ 35,541