Leases - Supplemental Cash Flow Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Leases [Abstract]
Operating cash flows from operating leases	$ 81,346
Operating cash flows from finance leases	1,195
Financing cash flows from finance leases	6,055
Operating leases	62,150
Right-of-use assets and liabilities recognized upon adoption of ASC 842	$ 733,584