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Leases - Components of Lease Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Leases [Abstract]      
Operating lease cost $ 5,125 $ 5,228  
Short-term lease cost 263 262  
Variable lease cost 5 (29)  
Sublease income (120) (131)  
Total lease cost $ 5,273 $ 5,330  
Rent expense under operating leases     $ 6,348
Rent expense offset by rent income     $ 42