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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 cost $ 46,082 $ 46,515
Variable lease cost 12,095 17,184
Short-term lease cost 4,964 6,617
Total operating lease cost 63,141 70,316
Amortization of leased assets 2,376 2,389
Interest on lease liabilities 627 439
Total finance lease cost $ 3,003 $ 2,828