Convertible Notes, Long-Term Debt and Credit Facility (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Long-term debt:
Long-term debt	$ 54,973	$ 62,105
Less amount reported as current	(24,068)	(26,415)
Long-term debt, less current portion	30,905	35,690
Term loan [Member]
Long-term debt:
Long-term debt	41,048	45,833
Revolving Credit Facility [Member]
Long-term debt:
Long-term debt	$ 13,925	$ 16,272