Real Estate Joint Ventures - Summarized Financial Information for Unconsolidated Investments (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Investment In Unconsolidated Affiliates [Line Items]
Investment in real estate, net	$ 321,812,000us-gaap_RealEstateInvestmentPropertyNet	$ 385,009,000us-gaap_RealEstateInvestmentPropertyNet
Cash and cash equivalents	34,515,000	21,894,000	165,980,000	162,391,000
Other assets	31,990,000us-gaap_OtherAssets	22,612,000us-gaap_OtherAssets
Total assets	1,303,135,000us-gaap_Assets	669,472,000us-gaap_Assets
Equity	971,209,000us-gaap_StockholdersEquity	558,354,000us-gaap_StockholdersEquity
Total liabilities and equity	1,303,135,000	669,472,000
Other Affiliates
Investment In Unconsolidated Affiliates [Line Items]
Investment in real estate, net	0	12,124,000
Cash and cash equivalents	15,461,000	16,897,000
Other assets	57,000	72,000
Total assets	15,518,000	29,093,000
Accounts payable and other liabilities	605,000	159,000
Equity	14,913,000	28,934,000
Total liabilities and equity	$ 15,518,000	$ 29,093,000

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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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Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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