Real Estate Joint Ventures - Summarized Financial Information for Unconsolidated Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Investment In Unconsolidated Affiliates [Line Items]
Cash and cash equivalents	$ 212,773	$ 34,515	$ 21,894	$ 165,980
Other assets	38,644	31,990
Total assets	984,813	1,303,135
Equity	665,263	971,209
Total liabilities and equity	984,813	1,303,135
Other Affiliates
Investment In Unconsolidated Affiliates [Line Items]
Cash and cash equivalents	13,760	15,461
Other assets	58	57
Total assets	13,818	15,518
Accounts payable and other liabilities	1,978	605
Equity	11,840	14,913
Total liabilities and equity	$ 13,818	$ 15,518