Deferred Loan Costs (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Debt Issuance Costs [Line Items]
Deferred loan costs	$ 2,957	$ 3,222
Other assets
Debt Issuance Costs [Line Items]
Deferred loan costs	1,087	1,169
Current portion of long-term debt
Debt Issuance Costs [Line Items]
Deferred loan costs	0	0
Long-term debt, less current portion
Debt Issuance Costs [Line Items]
Deferred loan costs	1,244	1,338
Accounts receivable securitization
Debt Issuance Costs [Line Items]
Deferred loan costs	$ 626	$ 715