Debt and Capital Lease Obligations - Schedule of Aggregate Annual Maturities of Long-term Debt and Capital Lease Obligations (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Revolving Credit, Maturity, Total	[1]	$ 207,322	$ 212,750
Capital Leases, Future Minimum Payments Due, 2018		1,601
Capital Leases, Future Minimum Payments Due, 2019		899
Capital Leases, Future Minimum Payments Due, 2020		454
Capital Leases, Future Minimum Payments Due, 2021		17
Capital Leases, Future Minimum Payments Due, Total		2,971
Capital Leases, Interest Included in Payments		(117)
Capital Leases, Present Value of Net Minimum Payments		2,854
Revolving Credit Agreement
Debt Instrument [Line Items]
Revolving Credit, Maturity, 2018		151,072
Revolving Credit, Maturity, 2019		56,250
Revolving Credit, Maturity, Total		$ 207,322

[1] Represents the weighted-average interest rate in effect at the respective periods for the revolving credit facilities and term loan borrowings, including any applicable margin. The interest rates do not include amortization of debt issuance costs or commitment fees.