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Lease Obligations (Schedule of Lease Information) (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
Lease Obligations [Abstract]          
Operating lease cost $ 850 $ 812 $ 2,559 $ 2,374  
Variable lease cost-operating leases 201 132 599 440  
Operating lease right-of-use assets 15,798 13,246 15,798 13,246 $ 13,246
Current liabilities 3,054 2,590 3,054 2,590  
Operating lease liabilities (noncurrent portion) 12,950 10,790 12,950 10,790  
Total operating lease liabilities $ 16,004 $ 13,380 $ 16,004 $ 13,380 $ 13,380