Agreements and Transactions with Related Parties - Related Party Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue from related parties:
Reimbursable costs from affiliates	$ 66,433	$ 55,837	$ 130,212
Asset management revenue	61,879	49,892	37,970
Structuring revenue	47,328	92,117	71,256
Distributions of Available Cash	45,121	38,406	31,052
Dealer manager fees	8,002	4,794	23,532
Other advisory revenue	2,435	203	0
Interest income on deferred acquisition fees and loans to affiliates	740	1,639	684
Deferred revenue earned	0	0	786
Total deferred revenue earned	$ 231,938	$ 242,888	$ 295,492