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Leases - Components of Lease Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Operating lease costs $ 42,520 $ 38,449
Financing lease costs:    
Amortization of right-of-use assets 870 845
Interest on lease liabilities 47 83
Total financing lease costs 917 928
Variable lease costs 2,473 4,361
Total lease costs $ 45,910 $ 43,738