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Lease Obligations (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Jan. 01, 2019
Lessee, Lease, Description [Line Items]      
Lease termination period   10 years  
Lease, Cost [Abstract]      
Operating lease cost $ 2,276 $ 6,447  
Short-term lease cost 5,363 13,375  
Finance lease cost:      
Amortization of right-of-use assets 69 140  
Interest on lease liabilities 9 12  
Total finance lease cost 78 152  
Cash paid for amounts included in the measurement of lease liabilities:      
Operating cash flows from operating leases   6,277  
Operating cash flows from finance leases   12  
Financing cash flows from finance leases   140  
Right-of-use assets obtained in exchange for lease obligations (noncash):      
Operating leases   8,138  
Finance leases   770  
Assets and Liabilities, Lessee [Abstract]      
Operating lease right-of-use assets 14,589 14,589 $ 13,600
Current portion of long-term lease obligations 7,492 7,492 6,200
Long-term lease obligations 7,191 7,191 $ 7,400
Total operating lease liabilities 14,683 14,683  
Property and equipment, at cost 1,433 1,433  
Accumulated depreciation (429) (429)  
Property and equipment, net 1,004 1,004  
Current maturities of long-term debt 208 208  
Long-term debt 582 582  
Total finance lease liabilities $ 790 $ 790  
Weighted Average Remaining Lease Term: Operating leases 2 years 7 months 6 days 2 years 7 months 6 days  
Weighted Average Remaining Lease Term: Financing leases 4 years 3 months 4 years 3 months  
Weighted Average Discount Rate: Operating lease 6.30% 6.30%  
Weighted Average Discount Rate: Financing lease 4.20% 4.20%  
Operating Leases      
2019 (excluding the nine months ended September 30, 2019) $ 1,839 $ 1,839  
2020 6,459 6,459  
2021 4,795 4,795  
2022 2,565 2,565  
2023 545 545  
Thereafter 21 21  
Total lease payments 16,224 16,224  
Less imputed interest (1,541) (1,541)  
Total operating lease liabilities 14,683 14,683  
Finance Leases      
2019 (excluding the nine months ended September 30, 2019) 78 78  
2020 209 209  
2021 186 186  
2022 161 161  
2023 154 154  
Thereafter 77 77  
Total lease payments 865 865  
Less imputed interest (75) (75)  
Total finance lease liabilities $ 790 $ 790  
Minimum      
Lessee, Lease, Description [Line Items]      
Lease renewal term   1 month  
Maximum      
Lessee, Lease, Description [Line Items]      
Lease renewal term   5 years