Leases - Narrative (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($) building	Jun. 30, 2019 USD ($) building
Lessee, Lease, Description [Line Items]
Pricing period		30 years
Number of buildings subleased | building	7	7
Rental and other revenues related to operating lease payments	$ 385,586	$ 766,670
Rental and other revenues related to operating lease payments, variable leases		$ 94,017
Minimum
Lessee, Lease, Description [Line Items]
Lease term extension period		1 year
Maximum
Lessee, Lease, Description [Line Items]
Lease term extension period		25 years