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Leases Lease Cost (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Leases [Abstract]      
Rental expense     $ 8,700
Straight-line lease cost $ 7,255 $ 7,780  
Operating Lease, Impairment Loss 0 312  
Operating Lease, Expense 7,255 8,092  
Depreciation 355 238  
Interest on lease liabilities 33 27  
Total finance lease cost 388 265  
Total lease cost $ 7,643 $ 8,357