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Leases - Supplemental cash flow information (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Leases    
Operating cash flows from operating leases $ 123,811 $ 164,159
Operating cash flows from finance leases 9,332 2,295
Financing cash flows from finance leases 23,227 10,454
Operating leases $ 17,967 61,872
Right-of-use assets and liabilities recognized at January 1, 2019 upon adoption of ASC 842   $ 730,180