Related Party Transactions and Investments in Non-Consolidated Entities - Management fees and interest income from loans (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Related Party Transactions and Investments in Non-Consolidated Entities
Asset management fees, low end of range (as a percent)	1.00%
Asset management fees, high end of range (as a percent)	5.00%
Notice period for cancellation of applicable contracts	30 days
Asset management fee income from non-consolidated entities	$ 154,000	$ 211,000