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Lease Obligations (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Lessee, Lease, Description [Line Items]      
Lease termination period 10 years    
Lease, Cost [Abstract]      
Operating lease cost $ 1,512 $ 2,159  
Short-term lease cost 2,124 3,281  
Finance lease cost:      
Amortization of right-of-use assets 50 56  
Interest on lease liabilities 6 8  
Total finance lease cost 56 64  
Cash paid for amounts included in the measurement of lease liabilities:      
Operating cash flows from operating leases 1,518 2,105  
Operating cash flows from finance leases 6 8  
Financing cash flows from finance leases 50 56  
Right-of-use assets obtained in exchange for lease obligations (noncash):      
Operating leases 896 3,540  
Finance leases 0 $ 0  
Assets and Liabilities, Lessee [Abstract]      
Operating lease right-of-use assets 15,804   $ 16,515
Current portion of long-term lease obligations 7,627   7,588
Long-term lease obligations 8,202   8,958
Total operating lease liabilities 15,829   16,546
Property and equipment, at cost 1,479   1,479
Accumulated depreciation $ (754)   $ (702)
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Property and equipment, net ($8,999 and $6,010 related to VIEs)   Property and equipment, net ($8,999 and $6,010 related to VIEs)
Property and equipment, net $ 725   $ 777
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Current maturities of long-term debt ($6,793 and $6,793 related to VIEs)   Current maturities of long-term debt ($6,793 and $6,793 related to VIEs)
Current maturities of long-term debt $ 179   $ 188
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Long-term debt ($62 and $53 related to VIEs)    
Long-term debt $ 330   372
Total finance lease liabilities $ 509   $ 560
Weighted average remaining lease term: operating leases 3 years 2 months 12 days   3 years 2 months 12 days
Weighted average remaining lease term: financing leases 3 years   3 years 2 months 12 days
Weighted average discount rate: operating lease 5.60%   5.70%
Weighted average discount rate: financing lease 4.20%   4.20%
Operating Leases      
2021 (excluding the three months ended March 31, 2021) $ 5,087    
2022 5,954    
2023 3,242    
2024 1,418    
2025 656    
2026 528    
Thereafter 628    
Total lease payments 17,513    
Less imputed interest (1,684)    
Total operating lease liabilities 15,829   $ 16,546
Finance Leases      
2021 (excluding the three months ended March 31, 2021) 158    
2022 154    
2023 154    
2024 77    
2025 0    
2026 0    
Thereafter 0    
Total lease payments 543    
Less imputed interest (34)    
Total finance lease liabilities $ 509   $ 560
Minimum      
Lessee, Lease, Description [Line Items]      
Lease renewal term 1 month    
Maximum      
Lessee, Lease, Description [Line Items]      
Lease renewal term 7 years