Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Schedule Of Long Term Debt And Short Term Debt Instruments [Line Items]
Finance leases and other debt	$ 913	$ 456
Unamortized debt issuance costs	(147)	(288)
Total long-term debt and finance leases	55,766	55,168
Less: Current maturities of long-term debt and finance leases	183	80
Long-term debt	55,583	55,088
Unsecured senior notes
Schedule Of Long Term Debt And Short Term Debt Instruments [Line Items]
Unsecured senior notes	55,000	55,000
Wells Fargo revolving credit facility
Schedule Of Long Term Debt And Short Term Debt Instruments [Line Items]
Total Short-Term Debt	$ 53,455	$ 54,613