Business and Basis of Presentation - Net Lease Costs (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Operating lease cost	$ 35,469
Variable lease cost	3,975
Sublease income	(10,273)
Total lease cost, net	29,171
Cash paid for amounts included in the measurement of operating lease liabilities	32,751
Cash receipts from sublease arrangements	7,828
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 1,386
Weighted average remaining lease term for operating leases (in years)	10 years 10 months 2 days
Weighted average discount rate for operating leases	6.96%
Cost for subleasing activities	$ 10,800