Fair Value - Debt and Capital Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, including current portion	$ 13,533	$ 15,832
Capital leases, including current portion	16,139	16,529
Total debt and capital lease commitments	29,672	32,361
Total debt and capital lease commitments	27,305	24,064
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, including current portion	11,976	14,024
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Capital leases, including current portion	$ 15,329	$ 10,040