Leases (Total Lease Cost) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Leases [Abstract]
Operating lease cost	$ 80,767	$ 239,672
Short-term operating lease cost	1,103	4,707
Variable operating lease cost	19,538	56,801
Sublease income	(1,062)	(2,995)
Total lease cost	$ 100,346	$ 298,185