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	$ 35,977	$ 168,668
Operating cash flows from finance leases	11,256	2,295
Financing cash flows from finance leases	31,181	10,454
Operating leases	$ 22,708	89,554
Right-of-use assets and liabilities recognized upon adoption of ASC 842		$ 733,584