Equity Investments in Real Estate (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity Method Investment, Financial Statement, Reported Amounts
Equity in earnings (losses) of equity method investments in real estate	$ 14,667	$ 24,073	$ (9,500)
Equity Method Investments
Equity Method Investment, Financial Statement, Reported Amounts
Equity in earnings (losses) of equity method investments in real estate	18,227	28,348	(5,607)
Equity Method Investments | Net Lease
Equity Method Investment, Financial Statement, Reported Amounts
Equity in earnings (losses) of equity method investments in real estate	21,692	12,571	(1,261)
Equity Method Investments | Self-Storage
Equity Method Investment, Financial Statement, Reported Amounts
Equity in earnings (losses) of equity method investments in real estate	(1,703)	(1,878)	(1,024)
Equity Method Investments | All Other
Equity Method Investment, Financial Statement, Reported Amounts
Equity in earnings (losses) of equity method investments in real estate	(1,762)	17,655	(3,322)
Amortization of Basis Difference on Equity Investments
Equity Method Investment, Financial Statement, Reported Amounts
Equity in earnings (losses) of equity method investments in real estate	(3,560)	(4,275)	(3,893)
Amortization of Basis Difference on Equity Investments | Net Lease
Equity Method Investment, Financial Statement, Reported Amounts
Equity in earnings (losses) of equity method investments in real estate	(2,263)	(3,381)	(3,514)
Amortization of Basis Difference on Equity Investments | Self-Storage
Equity Method Investment, Financial Statement, Reported Amounts
Equity in earnings (losses) of equity method investments in real estate	(155)	(155)	(66)
Amortization of Basis Difference on Equity Investments | All Other
Equity Method Investment, Financial Statement, Reported Amounts
Equity in earnings (losses) of equity method investments in real estate	$ (1,142)	$ (739)	$ (313)