Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Leases [Abstract]
Operating lease cost	$ 42,032	$ 132,546
Finance lease cost
Amortization of leased assets	1,880	4,518
Interest on leased assets	1,264	2,741
Short-term lease costs	810	2,800
Variable lease costs	4,483	11,056
Sublease income	(1,049)	(3,260)
Total lease cost	$ 49,420	$ 150,401