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Lease Obligations (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jan. 01, 2019
Lessee, Lease, Description [Line Items]      
Lease termination period   10 years  
Lease, Cost [Abstract]      
Operating lease cost $ 1,960 $ 4,171  
Short-term lease cost 3,269 8,012  
Finance lease cost:      
Amortization of right-of-use assets 39 71  
Interest on lease liabilities 1 3  
Total finance lease cost 40 74  
Cash paid for amounts included in the measurement of lease liabilities:      
Operating cash flows from operating leases   4,466  
Operating cash flows from finance leases   3  
Financing cash flows from finance leases   71  
Right-of-use assets obtained in exchange for lease obligations (noncash):      
Operating leases   6,311  
Finance leases   770  
Assets and Liabilities, Lessee [Abstract]      
Operating lease right-of-use assets 14,995 14,995 $ 13,600
Current portion of long-term lease obligations 7,059 7,059 6,200
Long-term lease obligations 8,030 8,030 $ 7,400
Total operating lease liabilities 15,089 15,089  
Property and equipment, at cost 1,433 1,433  
Accumulated depreciation (347) (347)  
Property and equipment, net 1,086 1,086  
Current maturities of long-term debt 234 234  
Long-term debt 626 626  
Total finance lease liabilities $ 860 $ 860  
Weighted Average Remaining Lease Term: Operating leases 2 years 9 months 4 days 2 years 9 months 4 days  
Weighted Average Remaining Lease Term: Financing leases 4 years 4 months 10 days 4 years 4 months 10 days  
Weighted Average Discount Rate: Operating lease 6.00% 6.00%  
Weighted Average Discount Rate: Financing lease 4.20% 4.20%  
Operating Lease Liabilities, Payments Due [Abstract]      
2019 (excluding the six months ended June 30, 2019) $ 4,206 $ 4,206  
2020 5,885 5,885  
2021 4,231 4,231  
2022 2,087 2,087  
2023 399 399  
Thereafter 5 5  
Total lease payments 16,813 16,813  
Less imputed interest (1,724) (1,724)  
Total operating lease liabilities 15,089 15,089  
Finance Lease Liabilities, Payments, Due [Abstract]      
2019 (excluding the six months ended June 30, 2019) 157 157  
2020 209 209  
2021 186 186  
2022 161 161  
2023 154 154  
Thereafter 77 77  
Total lease payments 944 944  
Less imputed interest (84) (84)  
Total finance lease liabilities $ 860 $ 860  
Minimum      
Lessee, Lease, Description [Line Items]      
Lease renewal term   1 month  
Maximum      
Lessee, Lease, Description [Line Items]      
Lease renewal term   5 years