Summarized Financial Information for Unconsolidated Investments (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013		Sep. 30, 2013	Dec. 31, 2012
Investment In Unconsolidated Affiliates [Line Items]
Investment in real estate	$ 324,064		$ 385,009
Cash and cash equivalents	61,582		21,894		22,831	165,980
Other assets	32,135		22,612
Total assets	1,318,850		669,472
Equity	975,800		558,354
Total liabilities and equity	1,318,850		669,472
Other Affiliates
Investment In Unconsolidated Affiliates [Line Items]
Investment in real estate	12,254		12,124
Cash and cash equivalents	15,917		16,897
Other assets	73		72
Total assets	28,244		29,093
Accounts payable and other liabilities	247		159
Equity	27,997	[1]	28,934	[1]
Total liabilities and equity	$ 28,244		$ 29,093

[1] The majority of the equity in unconsolidated investments relates to ALP. In 2008, the Company wrote-off its investment in ALP as a result of ALP reserving its assets to satisfy potential claims and obligations in accordance with its publicly reported liquidation basis of accounting. Subsequently, ALP 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 ALP’s change in accounting.