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Leases - Components of Lease Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Continuing Operations    
Lessee, Lease, Description [Line Items]    
Operating lease cost $ 83,938 $ 90,591
Finance lease cost, Amortization of right-of-use assets 651 1,394
Finance lease cost, Interest on lease liabilities 23 65
Variable lease cost 7,415 19,231
Short-term lease cost 92,161 119,737
Sublease income (6,797) (8,905)
Total lease expense 177,391 222,113
Discontinued Operations    
Lessee, Lease, Description [Line Items]    
Operating lease cost 792 809
Finance lease cost, Amortization of right-of-use assets 676 27
Finance lease cost, Interest on lease liabilities 117 2
Variable lease cost 0 0
Short-term lease cost 24,900 43,807
Sublease income (10,278) (25,832)
Total lease expense $ 16,207 $ 18,813