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Leases - Components of Lease Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 10, 2019
Leases      
Operating lease cost (1) $ 71,863 $ 223,825  
Short-term lease cost (2) 11,870 12,077  
Amortization of right-of-use assets 71,318 35,004  
Interest on lease liabilities 21,007 10,800  
Total finance lease cost 92,325 45,804  
Total lease costs 176,058 281,706  
Operating lease assets 104,271 $ 144,330 $ 495,000
Lease expense $ 159,000