Leases - Supplemental cash flow information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Leases
Operating cash flows from operating leases	$ 301,524
Operating cash flows from finance leases	9,826
Financing cash flows from finance leases	31,841
Operating leases	81,198
Finance leases	175,311
Right-of-use assets and liabilities recognized at January 1, 2019 upon adoption of ASC 842	$ 730,180