Equity Investments in Real Estate (Narratives) (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended	6 Months Ended			6 Months Ended		0 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended						0 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 Equity investments in real estate	Jun. 30, 2014 C1000 Logistiek Vastgooed B.V	Dec. 31, 2013 C1000 Logistiek Vastgooed B.V	Jun. 30, 2014 Shelborne	Jun. 30, 2014 IDL Wheel Tenant, LLC	Mar. 31, 2014 Bank Pekao	Jun. 30, 2014 Bank Pekao	Apr. 30, 2014 Lineage Logistics Holdings LLC	Jun. 30, 2014 Lineage Logistics Holdings LLC	Jun. 30, 2014 Third Party Shelborne	Jun. 30, 2014 Third Party BPS Nevada, LLC	Jun. 30, 2014 Third Party Madison Storage NYC, LLC and Veritas Group IX-NYC, LLC	Jun. 30, 2014 Third Party Lineage Logistics Holdings LLC	Jun. 30, 2014 CPA 18 - Global State Farm Mutual Automobile Company	Mar. 31, 2014 CPA 18 - Global Bank Pekao	Jun. 30, 2014 CPA 18 - Global Bank Pekao
Footnote Details
Non-recourse mortgage loans	$ 29,700,000		$ 29,700,000				$ 93,800,000	$ 95,600,000
Share of the non-recourse debt							79,800,000	81,300,000
Capital contributions to equity investments			149,115,000	51,439,000					9,100,000	21,300,000
Interest paid, capitalized										400,000
Unfunded commitments									2,000,000	22,800,000
Net income from equity investments in real estate	10,974,000	1,733,000	7,725,000	2,867,000					6,500,000					1,400,000
Aggregate distributions from our interests in other unconsolidated real estate investments			12,800,000		18,100,000							54,600,000
Unamortized basis differences on our equity investments	23,900,000		23,900,000		25,900,000
Amortization of the basis difference	1,000,000	900,000	1,900,000	1,700,000
Investment purchase price											74,000,000		20,400,000							147,900,000
Acquisition-related cost and fees, capitalized	2,033,000	1,226,000	2,045,000	3,405,000									400,000
Acquisition costs, expensed	272,000	724,000	1,401,000	1,795,000																8,400,000
Ownership interest, percentage															33.00%	15.00%	45.00%	7.00%	50.00%	50.00%	50.00%
Indirect ownership interest in equity investments																	40.00%
Transfer of assets noncash						$ (8,300,000)