Business and Basis of Presentation - Lease Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019
Operating Lease Payments
2019 (remaining six months)	$ 64,835
2020	124,838
2021	119,150
2022	114,681
2023	110,293
Thereafter	688,634
Total future minimum operating lease payments and estimated sublease cash receipts	1,222,431
Imputed interest	(380,929)
Total per the Condensed Consolidated Balance Sheet	841,502	$ 851,300
Sublease Cash Receipts
2019 (remaining six months)	18,345
2020	39,742
2021	41,475
2022	42,109
2023	42,953
Thereafter	171,154
Total future minimum operating lease payments and estimated sublease cash receipts (1)	$ 355,778