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Lease Obligations (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Jan. 01, 2019
Lessee, Lease, Description [Line Items]    
Lease termination period 10 years  
Lease, Cost [Abstract]    
Operating lease cost $ 2,211  
Short-term lease cost 4,743  
Amortization of right-of-use assets 32  
Interest on lease liabilities 2  
Total finance lease cost 34  
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases 2,383  
Operating cash flows from finance leases 2  
Financing cash flows from finance leases 32  
Right-of-use assets obtained in exchange for lease obligations (noncash):    
Operating leases 3,101  
Finance leases 76  
Assets and Liabilities, Lessee [Abstract]    
Operating lease right-of-use assets 15,290 $ 13,600
Current portion of long-term lease obligations 7,009 6,200
Long-term lease obligations 8,466 $ 7,400
Total operating lease liabilities 15,475  
Property and equipment, at cost 740  
Accumulated depreciation (323)  
Property and equipment, net 417  
Current maturities of long-term debt 134  
Long-term debt, net of current maturities 72  
Total finance lease liabilities $ 206  
Weighted Average Remaining Lease Term: Operating leases 2 years 10 months 13 days  
Weighted Average Remaining Lease Term: Financing leases 1 year 10 months 7 days  
Weighted Average Discount Rate: Operating lease 6.00%  
Weighted Average Discount Rate: Financing lease 3.80%  
Operating Lease Liabilities, Payments Due [Abstract]    
2019 (excluding the three months ended March 31, 2019) $ 5,179  
2020 5,903  
2021 4,163  
2022 2,025  
2023 289  
Thereafter 10  
Total lease payments 17,569  
Less imputed interest (2,094)  
Total operating lease liabilities 15,475  
Finance Lease Liabilities, Payments, Due [Abstract]    
2019 (excluding the three months ended March 31, 2019) 121  
2020 54  
2021 31  
2022 8  
2023 0  
Thereafter 0  
Total lease payments 214  
Less imputed interest (8)  
Total finance lease liabilities $ 206  
Minimum    
Lessee, Lease, Description [Line Items]    
Lease renewal term 1 month  
Maximum    
Lessee, Lease, Description [Line Items]    
Lease renewal term 5 years