Related Party Arrangements (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Related Party Arrangements
Management, development and other fees	$ 1,017	$ 1,231	$ 2,950	$ 3,484
Compensation expense			17,385	20,291
Unconsolidated real estate entities
Related Party Arrangements
Outstanding receivables	5,241		5,241		$ 3,924
Non Employee Director | Restricted stock and deferred stock awards
Related Party Arrangements
Compensation expense	459	$ 458	1,360	$ 1,288
Amount of deferred compensation	$ 996		$ 996		$ 594