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Leases - Lease Expenses (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Finance lease cost        
Amortization of right-of-use assets $ 28,897 $ 19,811 $ 54,062 $ 39,897
Interest on lease liabilities 28,438 27,111 56,263 54,634
Total finance lease cost 57,335 46,922 110,325 94,531
Operating lease cost 52,556 54,920 106,347 106,559
Total lease cost $ 109,891 $ 101,842 $ 216,672 $ 201,090