- Summarized Financial Information for Unconsolidated Investments (Details) (USD $)	Jun. 30, 2013		Dec. 31, 2012		Jun. 30, 2012	Dec. 31, 2011
Investment In Unconsolidated Affiliates [Line Items]
Investment in real estate	$ 379,755,000		$ 370,647,000
Cash and cash equivalents	54,183,000		165,980,000		169,899,000	162,391,000
Other assets	23,370,000		20,639,000
Total assets	662,524,000		645,521,000
Total liabilities and equity	662,524,000		645,521,000
Other Affiliates
Investment In Unconsolidated Affiliates [Line Items]
Investment in real estate	12,397,000		12,381,000
Cash and cash equivalents	17,798,000		18,523,000
Other assets	143,000		130,000
Total assets	30,338,000		31,034,000
Accounts payable and other liabilities	982,000		761,000
Equity	29,356,000	[1]	30,273,000	[1]
Total liabilities and equity	$ 30,338,000		$ 31,034,000

[1] The majority of the equity in unconsolidated investments relates to ALP Liquidating Trust (the "Trust"). In 2008, the Company wrote-off its investment in the Trust as a result of the Trust reserving its assets to satisfy potential claims and obligations in accordance with its publicly reported liquidation basis of accounting. Subsequently, the Trust changed its method of accounting to a going concern basis and reinstated its equity and stated it would report certain expenses as they are incurred. The Company has not recorded any additional equity income as a result of the Trust’s change in accounting.