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Leases - Total Lease Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Lessee, Lease, Description [Line Items]      
Operating Lease Cost $ 4,481 $ 4,253  
Sublease Receipts 0 0  
Operating Lease Cost Classified within Operating Expenses      
Lessee, Lease, Description [Line Items]      
Operating Lease Cost $ 4,481 $ 4,253 $ 4,700