Risk Management and Use of Derivative Financial Instruments (Narratives) (Details) (USD $)			12 Months Ended
	Dec. 31, 2013 property	Dec. 31, 2012	Dec. 31, 2013 Interest expense	Dec. 31, 2013 Other Income	Dec. 31, 2013 CPA: 16 - Global property	Dec. 31, 2012 CPA: 16 - Global	Dec. 31, 2013 CPA: 16 - Global Hotel property	Dec. 31, 2013 Cash Flow Hedging Interest rate cap	Dec. 31, 2013 Cash Flow Hedging Interest rate swap	Dec. 31, 2013 Not Designated as Hedging Instrument Interest rate swap Noncontrolling interest
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Total credit exposure on derivatives	$ 1,400,000
Summary of Derivative Instruments
Estimated amount reclassified from OCI to income, derivatives			1,800,000	1,400,000
Derivatives, net liability position	22,900,000	25,700,000
Aggregate termination value for immediate settlement	24,400,000	27,300,000
Equity method investment, ownership percentage					18.533%	18.33%
Assets	4,678,950,000	4,609,042,000			3,200,000,000
Number of real estate properties	418				467		2
Footnote Details
Derivative instrument, interest rate								1.30%
Derivative, Cap Interest Rate								2.00%
Notional Amount									72,240,000	27,500,000
Fair value										$ 3,000,000