Equity Investments in Real Estate (Narratives) (Details) (USD $)	12 Months Ended			1 Months Ended		12 Months Ended			12 Months Ended			1 Months Ended		12 Months Ended			1 Months Ended		12 Months Ended		1 Months Ended			12 Months Ended			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	May 31, 2011 CPA 14/16 Merger	Oct. 31, 2012 Walgreens Las Vegas	Dec. 31, 2012 Walgreens Las Vegas	Dec. 31, 2012 Hellweg Die Profi Baumarkt Gmbh And Co KG	May 31, 2011 Hellweg Die Profi Baumarkt Gmbh And Co KG	Dec. 31, 2012 Uhaul Moving Partners Inc And Mercury Partners LP	Dec. 31, 2011 Uhaul Moving Partners Inc And Mercury Partners LP	May 31, 2011 Uhaul Moving Partners Inc And Mercury Partners LP	Oct. 31, 2012 BPS Partners, LLC	Dec. 31, 2012 BPS Partners, LLC	Dec. 31, 2012 Berry Plastics Corporation	Dec. 31, 2011 Berry Plastics Corporation	Dec. 31, 2010 Berry Plastics Corporation	Mar. 31, 2011 C1000 Logistiek Vastgooed B.V	Jan. 31, 2011 C1000 Logistiek Vastgooed B.V	Dec. 31, 2012 C1000 Logistiek Vastgooed B.V	Dec. 31, 2011 C1000 Logistiek Vastgooed B.V	Jan. 31, 2011 C1000 Logistiek Vastgooed B.V CPA 15/17 Joint venture	Mar. 31, 2011 C1000 Logistiek Vastgooed B.V CPA 15/17 Joint venture	Dec. 31, 2012 Tesco plc	Dec. 31, 2012 Eroski Sociedad Cooperativa Mallorca	Dec. 31, 2012 Dicks Sporting Goods Inc	May 31, 2011 Dicks Sporting Goods Inc	Dec. 31, 2012 Shelborne	Dec. 31, 2012 Shelborne Initial Term Maximum	Dec. 31, 2012 Shelborne Initial Term Minimum	Dec. 31, 2012 Shelborne Extensions Maximum	Dec. 31, 2012 Shelborne Extensions Minimum	Dec. 31, 2012 I-Drive Live
Equity Investments in Real Estate
Income (loss) from equity investments in real estate	$ 7,828,000	$ 5,527,000	$ 1,675,000
Footnote Details
Equity method investments, distributions (return of capital)									2,100,000	1,000,000		8,300,000		2,300,000	2,100,000	2,500,000			12,900,000	92,600,000
Distributions From Equity Investment Loan Financing																				82,300,000
Capital contributions to equity investments	73,656,000	228,519,000	10,648,000	55,700,000			7,900,000											176,500,000			207,600,000			7,900,000								1,800,000
Gains on extinguishment of debt	1,900,000						5,900,000																	5,800,000
Income (loss) from equity investments in real estate	7,828,000	5,527,000	1,675,000
Payments to Acquire Investments [Abstract]
Investment purchase price					39,300,000
Payments for construction in progress					23,700,000	15,500,000																					60,500,000
Payments to acquire investments						115,000,000
Ownership interest, percentage							33.00%	33.00%	12.00%		12.00%	15.00%	15.00%	50.00%				85.00%	85.00%				49.00%	30.00%	45.00%	45.00%
Payment to acquire equity method investments	73,656,000	228,519,000	10,648,000	55,700,000			7,900,000											176,500,000			207,600,000			7,900,000								1,800,000
Noncontrolling interest																		15.00%
Basis differences on equity method investments				27,400,000
Gain on deconsolidation of a subsidiary												1,100,000
Construction loan, principal												30,000,000															125,000,000					50,000,000
Interest income												2,900,000
Transaction Costs																		10,600,000			12,500,000
Short term borrowings																		90,000,000
Non recourse debt	469,600,000	234,500,000															82,300,000					98,300,000
Equity method investments, distributions (return of capital)									2,100,000	1,000,000		8,300,000		2,300,000	2,100,000	2,500,000			12,900,000	92,600,000
Debt, variable rate basis																	Euro Inter-bank offered rate ("Euribor")
Debt, variable rate spread																	2.00%
Debt, maturity date																	Mar. 01, 2013										Dec. 01, 2015					Nov. 01, 2017
Fair value of properties, equity method investee				947,300,000
Fair value of the mortgages, equity method investee				581,600,000
Interest Rate																												8.00%	6.00%	12.00%	10.00%	9.00%
Unfunded Commitment																											64,500,000					48,200,000
Foreign currency exchange rate	$ 1.3218	$ 1.2950																														$ 1.278