Leases - Lease Costs and Other Quantitative Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Leases [Abstract]
Operating lease cost	$ 67,044	$ 65	$ 64,086
Variable lease cost	18,879
Sublease rental income	(8,965)	$ (3,671)	$ (2,797)
Total lease cost	76,958
Operating cash flows	69,735
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 269,801
Weighted average remaining lease term (in years) - Operating leases	5 years 3 months 23 days
Weighted average discount rate - Operating leases	8.60%