Summary of Significant Accounting Policies (Details) $ in Thousands	Sep. 30, 2019 USD ($) joint_venture	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)
Summary of Significant Accounting Policies
Real Estate Interests, Number of Joint Ventures | joint_venture	2
Equity Method Investment, Ownership Percentage	50.00%
Operating Lease, Right-of-Use Asset	$ 145,695	$ 150,803	$ 0
Intangible Assets, Net (Excluding Goodwill)	0	5,676	52,448
Accounts payable and other liabilities	193,008	183,129	203,833
Operating Lease, Liability	$ 121,783	124,735	$ 0
Accounting Standards Update 2016-02 [Member]
Summary of Significant Accounting Policies
Operating Lease, Right-of-Use Asset		150,803
Intangible Assets, Net (Excluding Goodwill)		(46,772)
Accounts payable and other liabilities		(20,704)
Operating Lease, Liability		$ 124,735