Real Estate Joint Ventures - Summarized Financial Information for Unconsolidated Investments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Investment In Unconsolidated Affiliates [Line Items]
Cash and cash equivalents	$ 289,708	$ 34,515	$ 237,419	$ 21,894
Other assets	34,400us-gaap_OtherAssets	31,990us-gaap_OtherAssets
Total assets	1,305,492us-gaap_Assets	1,303,135us-gaap_Assets
Equity	970,244us-gaap_StockholdersEquity	971,209us-gaap_StockholdersEquity
Total liabilities and equity	1,305,492	1,303,135
Other Affiliates
Investment In Unconsolidated Affiliates [Line Items]
Cash and cash equivalents	14,987	15,461
Other assets	58	57
Total assets	15,045	15,518
Accounts payable and other liabilities	483	605
Equity	14,562	14,913
Total liabilities and equity	$ 15,045	$ 15,518

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Sum of the carrying values as of the balance sheet date of obligations incurred through that date, including liabilities incurred and payable to vendors for goods and services received, taxes, interest, rent and utilities, compensation costs, payroll taxes and fringe benefits (other than pension and postretirement obligations), contractual rights and obligations, and statutory obligations.

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