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Leases - Lease Cost (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Finance Lease Expense    
Amortization of finance lease assets $ 9,514 $ 0
Interest on obligations under finance leases 1,098 0
Total finance lease expense 10,612 0
Operating Lease Expense    
Total operating lease expense 52,395 42,518
Cost of leasing and services    
Operating Lease Expense    
Fixed lease expense 2,131 3,074
Short-term lease expense 11,575 13,603
Variable lease expense 3,373 3,657
Selling, general and administrative    
Operating Lease Expense    
Fixed lease expense 29,359 16,866
Short-term lease expense 723 851
Variable lease expense 3,792 2,131
Lease impairment expense and other related charges    
Operating Lease Expense    
Fixed lease expense 1,107 1,359
Short-term lease expense 0 466
Variable lease expense $ 335 $ 511