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Lease Obligations (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Lessee, Lease, Description [Line Items]          
Lease termination period     10 years    
Lease, Cost [Abstract]          
Operating lease cost $ 1,672 $ 2,187 $ 4,694 $ 6,421  
Short-term lease cost 3,813 3,311 8,848 10,337  
Finance lease cost:          
Amortization of right-of-use assets 46 49 151 154  
Interest on lease liabilities 5 7 16 22  
Total finance lease cost 51 $ 56 167 176  
Cash paid for amounts included in the measurement of lease liabilities:          
Operating cash flows from operating leases     4,627 6,281  
Operating cash flows from finance leases     16 22  
Financing cash flows from finance leases     151 154  
Right-of-use assets obtained in exchange for lease obligations (non-cash):          
Operating leases     6,221 7,679  
Finance leases     0 $ 0  
Assets and Liabilities, Lessee [Abstract]          
Operating lease right-of-use assets 17,470   17,470   $ 16,515
Current portion of long-term lease obligations 8,314   8,314   7,588
Long-term lease obligations 9,306   9,306   8,958
Total operating lease liabilities 17,620   17,620   16,546
Property and equipment, at cost 1,479   1,479   1,479
Accumulated depreciation $ (857)   $ (857)   $ (702)
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Property and equipment, net ($9,943 and $6,010 related to VIEs)   Property and equipment, net ($9,943 and $6,010 related to VIEs)   Property and equipment, net ($9,943 and $6,010 related to VIEs)
Property and equipment, net $ 622   $ 622   $ 777
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Current maturities of long-term debt ($4,857 and $6,793 related to VIEs)   Current maturities of long-term debt ($4,857 and $6,793 related to VIEs)   Current maturities of long-term debt ($4,857 and $6,793 related to VIEs)
Current maturities of long-term debt $ 157   $ 157   $ 188
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Long-term debt ($69 and $53 related to VIEs)   Long-term debt ($69 and $53 related to VIEs)   Long-term debt ($69 and $53 related to VIEs)
Long-term debt $ 260   $ 260   $ 372
Total finance lease liabilities $ 417   $ 417   $ 560
Weighted average remaining lease term: operating leases 3 years 4 months 24 days   3 years 4 months 24 days   3 years 2 months 12 days
Weighted average remaining lease term: financing leases 2 years 8 months 12 days   2 years 8 months 12 days   3 years 2 months 12 days
Weighted average discount rate: operating lease 5.40%   5.40%   5.70%
Weighted average discount rate: financing lease 4.20%   4.20%   4.20%
Operating Leases          
2021 (excluding the nine months ended September 30, 2021) $ 1,742   $ 1,742    
2022 7,377   7,377    
2023 4,773   4,773    
2024 2,558   2,558    
2025 1,293   1,293    
2026 1,005   1,005    
Thereafter 629   629    
Total lease payments 19,377   19,377    
Less imputed interest (1,757)   (1,757)    
Total operating lease liabilities 17,620   17,620   $ 16,546
Finance Leases          
2021 (excluding the nine months ended September 30, 2021) 49   49    
2022 161   161    
2023 155   155    
2024 77   77    
2025 0   0    
2026 0   0    
Thereafter 0   0    
Total lease payments 442   442    
Less imputed interest (25)   (25)    
Total finance lease liabilities $ 417   $ 417   $ 560
Minimum          
Lessee, Lease, Description [Line Items]          
Lease renewal term     1 month    
Maximum          
Lessee, Lease, Description [Line Items]          
Lease renewal term     7 years