Risk Management and Use of Derivative Financial Instruments (Narratives) (Details)			9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended																		3 Months Ended		9 Months Ended
	Sep. 30, 2014 USD ($)	Dec. 31, 2013 USD ($)	Sep. 30, 2014 Interest expense USD ($)	Sep. 30, 2014 Other Income USD ($)	Sep. 30, 2014 Cash Flow Hedging USD ($)	Sep. 30, 2013 Cash Flow Hedging USD ($)	Sep. 30, 2014 Cash Flow Hedging USD ($)	Sep. 30, 2013 Cash Flow Hedging USD ($)	Sep. 30, 2014 Cash Flow Hedging Interest rate swap USD ($)	Sep. 30, 2013 Cash Flow Hedging Interest rate swap USD ($)	Sep. 30, 2014 Cash Flow Hedging Interest rate swap USD ($)	Sep. 30, 2013 Cash Flow Hedging Interest rate swap USD ($)	Sep. 30, 2014 Cash Flow Hedging Foreign currency contracts USD ($)	Sep. 30, 2013 Cash Flow Hedging Foreign currency contracts USD ($)	Sep. 30, 2014 Cash Flow Hedging Foreign currency contracts USD ($)	Sep. 30, 2013 Cash Flow Hedging Foreign currency contracts USD ($)	Sep. 30, 2014 Cash Flow Hedging Interest rate caps USD ($)	Sep. 30, 2013 Cash Flow Hedging Interest rate caps USD ($)	Sep. 30, 2014 Cash Flow Hedging Interest rate caps USD ($)	Sep. 30, 2013 Cash Flow Hedging Interest rate caps USD ($)	Sep. 30, 2014 Accounts Payable and Accrued Liabilities Designated as Hedging Instrument Interest rate swap USD ($)	Dec. 31, 2013 Accounts Payable and Accrued Liabilities Designated as Hedging Instrument Interest rate swap USD ($)	Sep. 30, 2014 Accounts Payable and Accrued Liabilities Designated as Hedging Instrument Foreign currency contracts USD ($)	Dec. 31, 2013 Accounts Payable and Accrued Liabilities Designated as Hedging Instrument Foreign currency contracts USD ($)	Sep. 30, 2014 Accounts Payable and Accrued Liabilities Designated as Hedging Instrument CPA: 16 - Global Interest rate swap USD ($)	Sep. 30, 2014 Accounts Payable and Accrued Liabilities Designated as Hedging Instrument CPA: 16 - Global Foreign currency contracts USD ($)	Sep. 30, 2014 Accounts Payable and Accrued Liabilities Not Designated as Hedging Instrument Interest rate swap USD ($)	Dec. 31, 2013 Accounts Payable and Accrued Liabilities Not Designated as Hedging Instrument Interest rate swap USD ($)	Sep. 30, 2014 Other Assets Designated as Hedging Instrument Interest rate swap USD ($)	Dec. 31, 2013 Other Assets Designated as Hedging Instrument Interest rate swap USD ($)	Sep. 30, 2014 Other Assets Designated as Hedging Instrument Foreign currency contracts USD ($)	Dec. 31, 2013 Other Assets Designated as Hedging Instrument Foreign currency contracts USD ($)	Sep. 30, 2014 Other Assets Designated as Hedging Instrument Interest rate caps USD ($)	Dec. 31, 2013 Other Assets Designated as Hedging Instrument Interest rate caps USD ($)	Sep. 30, 2014 Other Assets Not Designated as Hedging Instrument Stock warrants USD ($)	Dec. 31, 2013 Other Assets Not Designated as Hedging Instrument Stock warrants USD ($)	Sep. 30, 2014 Equity method investments Cash Flow Hedging USD ($)	Sep. 30, 2013 Equity method investments Cash Flow Hedging USD ($)	Sep. 30, 2014 Equity method investments Cash Flow Hedging USD ($)	Sep. 30, 2013 Equity method investments Cash Flow Hedging USD ($)	Sep. 30, 2014 CPA: 16 - Global Level 3 Other Assets Not Designated as Hedging Instrument Stock warrants USD ($)	Sep. 30, 2014 Euro Cash Flow Hedging Interest rate caps	Sep. 30, 2014 Euro Cash Flow Hedging Interest rate cap two	Sep. 30, 2014 Revolving Credit Facility Euro USD ($)	Sep. 30, 2014 Revolving Credit Facility Euro EUR (€)
Footnote Details
Derivatives in liability position	$ 14,581,000	$ 21,812,000																			$ 5,097,000	$ 2,734,000	$ 451,000	$ 7,083,000	$ 2,000,000	$ 1,200,000	$ 9,033,000	$ 11,995,000
Stock warrants, fair value	8,375,000	3,780,000																											987,000	1,618,000	3,629,000	0	6,000	2,000	3,753,000	2,160,000					1,300,000
Amount of Gain (Loss) Recognized in Other Comprehensive (Loss) Income on Derivatives (Effective Portion)					16,075,000	(4,065,000)	11,321,000	771,000	689,000	16,000	(928,000)	3,669,000	15,372,000	(4,058,000)	12,256,000	(2,885,000)	14,000	(23,000)	(7,000)	(13,000)																	100,000	100,000	300,000	500,000
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net					(324,000)	(642,000)	(2,511,000)	(1,493,000)																													(100,000)	(100,000)	(400,000)	(500,000)
Derivative instrument, interest rate																																										1.20%	1.10%
Derivative, Cap Interest Rate																																										3.00%	2.00%
Summary of Derivative Instruments
Estimated amount reclassified from OCI to income, derivatives			2,400,000	1,500,000
Total credit exposure on derivatives	3,700,000
Credit exposure to any single counterparty	1,800,000
Derivatives, net liability position	15,700,000
Aggregate termination value for immediate settlement	16,100,000
Senior unsecured credit facility and unsecured term loan	$ 618,945,000	$ 575,000,000																																										$ 226,400,000	€ 178,500,000