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Leases - Lease Costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lease Cost    
Operating Lease Cost $ 5,837 $ 5,371
Variable Lease Cost 1,166 1,068
Total Lease Cost 7,003 6,439
Lease Cash Flows    
Operating Cash Flows from Operating Leases $ 5,431 $ 4,893