Long-term Debt, Line of Credit and Derivatives - Obligations under Debt Arrangements (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Principal, current	$ 14,156	$ 19,813
Principal	95,531	104,563
Deferred Issuance Costs, current	(444)	(625)
Deferred Issuance Costs	(2,997)	(3,298)
Net Value, current	13,712	19,188
Net Value, long-term	78,822	82,077
Total debt	92,534	101,265
Revolving line of credit | Line of Credit
Debt Instrument [Line Items]
Principal, current	1,500	8,000
Deferred Issuance Costs, current	(47)	(252)
Net Value, current	1,453	7,748
Term loan - current | Loans Payable
Debt Instrument [Line Items]
Principal, current	12,656	11,813
Deferred Issuance Costs, current	(397)	(373)
Net Value, current	12,259	11,440
Term loan - long-term | Loans Payable
Debt Instrument [Line Items]
Principal, long-term	81,375	84,750
Deferred Issuance Costs, long-term	(2,553)	(2,673)
Net Value, long-term	$ 78,822	$ 82,077