Basis of Presentation (Details) $ in Thousands	Jun. 30, 2019 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($) lease
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liabilities	$ 230,816		$ 0
Operating lease right-of-use assets	$ 221,479		$ 0
Operating ground leases
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of leases | lease			21
Corporate facility leases
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of leases | lease			2
ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liabilities		$ 104,863
Operating lease right-of-use assets		$ 95,506