Related Party Arrangements (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Related Party Arrangements
Management, development and other fees	$ 926	$ 1,114	$ 1,933	$ 2,252
Compensation expense			11,624	13,129
Unconsolidated real estate entities
Related Party Arrangements
Outstanding receivables	1,795		1,795		$ 3,924
Non Employee Director | Restricted stock and deferred stock awards
Related Party Arrangements
Compensation expense	446	$ 405	901	$ 830
Amount of deferred compensation	$ 1,389		$ 1,389		$ 594