Credit Facilities and Long-Term Debt - Deferred Financing Costs, Invoice Factoring and Subordinated Notes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Debt Instrument [Line Items]
Total outstanding debt	$ 32,706		$ 70,265
Amortization of debt financing costs	394	$ 388
Debt Issuance Costs, Gross	400
Subordinated Debt
Debt Instrument [Line Items]
Total outstanding debt	$ 22,576		$ 21,911