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Operating Leases - Components of Lease Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Operating lease expense $ 18,994 $ 18,075
Short-term lease expense 165 462
Variable lease expense 97 46
Sublease income (138) (322)
Total $ 19,118 $ 18,261