Investment in Unconsolidated Ventures (Financial Position of Unconsolidated Real Estate Ventures) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Financial position of the Real Estate Ventures
Equity Method Investment Summarized Financial Information Debt	$ 699,860
Company's share of equity (Company's basis)	180,512	193,555	115,807
Unconsolidated real estate ventures [Member]
Financial position of the Real Estate Ventures
Net property	965,475	923,536
Other Assets	164,152	174,677
Other Liabilities	49,442	53,645
Equity Method Investment Summarized Financial Information Debt	699,860	724,780
Equity	380,325	319,788
Company's share of equity (Company's basis)	$ 180,512	$ 193,555