Equity Investments in the Managed Programs and Real Estate - Summarized Balance Sheet for Equity Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Combined Equity Investments
Equity Method Investment Summarized Financial Information
Real estate, net	$ 460,198	$ 464,730
Other assets	56,737	64,989
Total assets	516,935	529,719
Debt	(193,521)	(201,611)
Accounts payable, accrued expenses and other liabilities	(10,354)	(9,749)
Total liabilities	(203,875)	(211,360)
Stockholders’ equity	313,060	318,359
Managed Programs
Equity Method Investment Summarized Financial Information
Real estate, net	8,464,447	7,274,549
Other assets	2,737,441	2,492,789
Total assets	11,201,888	9,767,338
Debt	(5,128,640)	(4,535,506)
Accounts payable, accrued expenses and other liabilities	(943,090)	(652,139)
Total liabilities	(6,071,730)	(5,187,645)
Noncontrolling interests	(263,783)	(287,051)
Stockholders’ equity	$ 4,866,375	$ 4,292,642