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Lease Obligations (Schedule of Lease Information) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Lease Obligations [Abstract]      
Operating lease cost $ 854 $ 750  
Variable lease cost-operating leases 202 $ 132  
Operating lease right-of-use assets 14,084   $ 13,246
Current liabilities 2,816   2,590
Operating lease liabilities (noncurrent portion) 11,430   10,790
Total operating lease liabilities $ 14,246   $ 13,380