Business and Basis of Presentation - Net Lease Costs (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Operating lease cost	$ 35,443	$ 106,958
Variable lease cost	3,902	11,517
Sublease income	(10,205)	(30,767)
Total lease cost, net	29,140	87,708
Cash paid for amounts included in the measurement of operating lease liabilities	34,294	100,172
Cash receipts from sublease arrangements	9,000	25,131
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 38,571	$ 67,756
Weighted average remaining lease term for operating leases (in years)	10 years 6 months	10 years 6 months
Weighted average discount rate for operating leases	6.90%	6.90%
Cost for subleasing activities	$ 10,800	$ 32,500