Quarterly report pursuant to Section 13 or 15(d)

Leases - Components of Lease Costs (Details)

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Leases - Components of Lease Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Finance lease cost:        
Amortization of lease assets $ 231 $ 53 $ 705 $ 515
Interest on lease liabilities 18 16 68 50
Operating lease cost 25,323 29,577 80,046 89,289
Short-term and variable lease cost 176,605 160,365 494,846 478,683
Total lease cost $ 202,177 $ 190,011 $ 575,665 $ 568,537