Risk Management and Use of Derivative Financial Instruments (Narratives) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Footnote Details
Derivatives in liability position	$ 29,134,000		$ 29,134,000		$ 21,812,000
Stock warrants, fair value	4,303,000		4,303,000		3,780,000
Real estate revenue	176,734,000	77,657,000	311,806,000	154,141,000
Summary of Derivative Instruments
Total credit exposure on derivatives	200,000		200,000
Credit exposure to any single counterparty	100,000		100,000
Derivatives, net liability position	30,300,000		30,300,000
Aggregate termination value for immediate settlement	31,700,000		31,700,000
Interest expense
Summary of Derivative Instruments
Estimated amount reclassified from OCI to income, derivatives			2,600,000
Other Income
Summary of Derivative Instruments
Estimated amount reclassified from OCI to income, derivatives			1,600,000
Cash Flow Hedging
Footnote Details
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives (Effective Portion)	(1,886,000)	1,768,000	(4,753,000)	4,841,000
Amount of Gain (Loss) Reclassified from Other Comprehensive Income into Income (Effective Portion)	(1,074,000)	464,000	(2,159,000)	851,000
Cash Flow Hedging | Interest rate swap
Footnote Details
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives (Effective Portion)	(1,431,000)	2,825,000	(1,617,000)	3,653,000
Amount of Gain (Loss) Reclassified from Other Comprehensive Income into Income (Effective Portion)	(634,000)	441,000	(1,335,000)	875,000
Cash Flow Hedging | Foreign currency contracts
Footnote Details
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives (Effective Portion)	(451,000)	(1,070,000)	(3,115,000)	1,178,000
Amount of Gain (Loss) Reclassified from Other Comprehensive Income into Income (Effective Portion)	(440,000)	23,000	(824,000)	(24,000)
Cash Flow Hedging | Interest rate caps
Footnote Details
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives (Effective Portion)	(4,000)	13,000	(21,000)	10,000
Derivative instrument, interest rate	1.30%		1.30%
Derivative, Cap Interest Rate	3.00%		3.00%
Cash Flow Hedging | Interest Rate Cap Two
Footnote Details
Derivative instrument, interest rate	1.20%		1.20%
Derivative, Cap Interest Rate	2.00%		2.00%
Accounts Payable and Accrued Liabilities | Designated as Hedging Instrument | Interest rate swap
Footnote Details
Derivatives in liability position	5,894,000		5,894,000		2,734,000
Accounts Payable and Accrued Liabilities | Designated as Hedging Instrument | Foreign currency contracts
Footnote Details
Derivatives in liability position	12,506,000		12,506,000		7,083,000
Accounts Payable and Accrued Liabilities | Designated as Hedging Instrument | CPA: 16 - Global | Interest rate swap
Footnote Details
Derivatives in liability position	2,500,000		2,500,000
Accounts Payable and Accrued Liabilities | Designated as Hedging Instrument | CPA: 16 - Global | Foreign currency contracts
Footnote Details
Derivatives in liability position	5,100,000		5,100,000
Accounts Payable and Accrued Liabilities | Not Designated as Hedging Instrument | Interest rate swap
Footnote Details
Derivatives in liability position	10,734,000		10,734,000		11,995,000
Other Assets | Designated as Hedging Instrument | Interest rate swap
Footnote Details
Stock warrants, fair value	806,000		806,000		1,618,000
Other Assets | Designated as Hedging Instrument | Interest rate caps
Footnote Details
Stock warrants, fair value	12,000		12,000		2,000
Other Assets | Not Designated as Hedging Instrument | Warrant [Member]
Footnote Details
Stock warrants, fair value	3,485,000		3,485,000		2,160,000
Equity method investments | Cash Flow Hedging
Footnote Details
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives (Effective Portion)	100,000	300,000	100,000	400,000
Amount of Gain (Loss) Reclassified from Other Comprehensive Income into Income (Effective Portion)	200,000	300,000	300,000	400,000
CPA: 16 - Global | Level 3 | Other Assets | Not Designated as Hedging Instrument | Warrant [Member]
Footnote Details
Stock warrants, fair value	$ 1,300,000		$ 1,300,000