Net Investments in Properties (Narratives) (Details) (USD $)			6 Months Ended										6 Months Ended
	Jun. 30, 2014 property	Dec. 31, 2013	Jun. 30, 2014 Direct financing lease	Jun. 30, 2014 Assets held-for-sale	Dec. 31, 2013 Assets held-for-sale property	Jun. 30, 2014 CPA: 16 - Global	Mar. 31, 2014 CPA: 16 - Global	Jan. 31, 2014 CPA: 16 - Global	Jan. 31, 2014 CPA: 16 - Global Assets held-for-sale property	Jun. 30, 2014 Real estate	Dec. 31, 2013 Real estate	Jun. 30, 2014 Real estate CPA: 16 - Global property	Jun. 30, 2014 Business combination	Jun. 30, 2014 Business combination Office Building	Jun. 30, 2014 Business combination Distribution Facility	Jun. 30, 2014 Hotel property	Jun. 30, 2014 Self-storage property
Real Estate Properties
Number of real estate properties	686				9				10			225				2	2
Net investments in properties	$ 4,365,388,000	$ 2,353,391,000				$ 1,970,175,000	$ 1,969,274,000	$ 1,970,175,000		$ 4,283,456,000	$ 2,348,249,000
Reclassification to real estate owned			7,000,000
Reclassification from real estate owned				1,300,000
Investments in real estate
Investment purchase price													89,100,000	41,900,000	47,200,000
Land acquired													13,300,000
Buildings acquired													60,300,000
Acquired finite-lived intangible asset, business combination													15,500,000
Acquisition costs, expensed													200,000
Assets Held For Sale
Assets held for sale	$ 0	$ 86,823,000				$ 133,415,000	$ 132,951,000	$ 133,415,000