Leases - Leases Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Leases [Abstract]
Operating lease costs	$ 33,900	$ 38,700	$ 71,700	$ 75,800
Variable lease payments	$ 600	$ 3,200	$ 2,600	$ 5,400
Weighted average remaining lease term (in years)	9 years 4 months 24 days	7 years 1 month 6 days	9 years 4 months 24 days	7 years 1 month 6 days
Weighted average discount rate	392.00%	430.00%	392.00%	430.00%
Operating cash outflows from operating leases	$ 37,517	$ 33,599	$ 75,313	$ 50,852
Leased assets obtained in exchange for new operating lease liabilities	9,994	$ 26,056	374,893	$ 30,100
Leases not yet commenced	$ 3,000		$ 3,000