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Lease Obligations (Schedule of Lease Information) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Lease Obligations [Abstract]          
Operating lease cost $ 932 $ 854 $ 1,884 $ 1,709  
Variable lease cost-operating leases 244 196 490 398  
Operating lease right-of-use assets 13,980   13,980   $ 14,988
Current liabilities 3,379   3,379   3,348
Operating lease liabilities (noncurrent portion) 12,123   12,123   13,298
Deferred Expenses (1,246) $ (1,422) (1,246) $ (1,422) (1,422)
Total Operating Lease Liabilities $ 14,256   $ 14,256   $ 15,224