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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 $ 11,994    
Variable lease costs 6,487    
Sublease income (3,888)    
Total net lease cost 14,593    
ROU asset impairment $ 5,350 $ 6,268 $ 0