Basis of Presentation Basis of Presentation - Narratives (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($) vie	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) vie	Jun. 30, 2018 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2018 vie
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Variable interest entities, count | vie	5		5			5
Variable interest entities consolidated, count | vie	4		4			4
Adjustments
Decrease to income taxes	$ (983)	$ (3,238)	$ (1,103)	$ (2,531)
Operating lease right-of-use assets	49,263		49,263
Operating lease liabilities	71,415		71,415
ASU 2016-02
Adjustments
Operating lease right-of-use assets					$ 52,600
Operating lease liabilities					70,500
Below-market ground lease and parking garage lease intangible assets, above-market ground lease intangible liabilities and deferred rent					$ (17,900)
Adjustments | Out of period adjustments
Adjustments
Decrease to income taxes	$ 800		$ 500