Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases
Operating cash flows from operating leases	$ 72,352	$ 227,451
Operating cash flows from finance leases	21,007	10,800
Financing cash flows from finance leases	65,979	34,358
Operating leases	$ 47,225	118,381
Finance leases		187,339
Right-of-use assets and liabilities recognized upon adoption of ASC 842		$ 733,584