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Operating Leases - Components of Lease Costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Operating lease costs $ 3,578 $ 3,821
Short-term lease costs 1,763 2,042
Variable lease costs 842 845
Lease costs $ 6,183 $ 6,708