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Lease Obligations (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Lessee, Lease, Description [Line Items]          
Lease termination period     10 years    
Lease, Cost [Abstract]          
Operating lease cost $ 2,187 $ 2,276 $ 6,421 $ 6,447  
Short-term lease cost 3,311 5,363 10,337 13,375  
Finance lease cost:          
Amortization of right-of-use assets 49 69 154 140  
Interest on lease liabilities 7 9 22 12  
Total finance lease cost 56 $ 78 176 152  
Cash paid for amounts included in the measurement of lease liabilities:          
Operating cash flows from operating leases     6,281 6,277  
Operating cash flows from finance leases     22 12  
Financing cash flows from finance leases     154 140  
Right-of-use assets obtained in exchange for lease obligations (noncash):          
Operating leases     7,679 8,138  
Finance leases     0 $ 770  
Assets and Liabilities, Lessee [Abstract]          
Operating lease right-of-use assets 17,250   17,250   $ 13,979
Current portion of long-term lease obligations 7,624   7,624   7,095
Long-term lease obligations 9,668   9,668   6,976
Total operating lease liabilities 17,292   17,292   14,071
Property and equipment, at cost 1,479   1,479   1,479
Accumulated depreciation (647)   (647)   (482)
Property and equipment, net 832   832   997
Current maturities of long-term debt 193   193   204
Long-term debt 417   417   560
Total finance lease liabilities $ 610   $ 610   $ 764
Weighted average remaining lease term: operating leases 3 years 4 months 24 days   3 years 4 months 24 days   2 years 6 months
Weighted average remaining lease term: financing leases 3 years 8 months 12 days   3 years 8 months 12 days   4 years
Weighted average discount rate: operating lease 5.70%   5.70%   6.00%
Weighted average discount rate: financing lease 4.20%   4.20%   4.20%
Operating Leases          
2020 (excluding the nine months ended September 30, 2020) $ 1,774   $ 1,774    
2021 7,231   7,231    
2022 5,177   5,177    
2023 2,568   2,568    
2024 1,021   1,021    
Thereafter 1,549   1,549    
Total lease payments 19,320   19,320    
Less imputed interest (2,028)   (2,028)    
Total operating lease liabilities 17,292   17,292   $ 14,071
Finance Leases          
2020 (excluding the nine months ended September 30, 2020) 56   56    
2021 208   208    
2022 161   161    
2023 154   154    
2024 77   77    
Thereafter 0   0    
Total lease payments 656   656    
Less imputed interest (46)   (46)    
Total finance lease liabilities $ 610   $ 610   $ 764
Minimum          
Lessee, Lease, Description [Line Items]          
Lease renewal term     1 month    
Maximum          
Lessee, Lease, Description [Line Items]          
Lease renewal term     8 years