Acquisitions of CapLease, Cole and CCPT - CapLease Acquisition Narrative (Details) (USD $) In Thousands, unless otherwise specified			0 Months Ended		6 Months Ended	8 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Nov. 05, 2013 CapLease [Member]		Jun. 30, 2014 CapLease [Member] property	Jun. 30, 2014 CapLease [Member]	Jun. 30, 2014 CapLease [Member] Real Estate Investment Segment [Member]
Business Acquisition [Line Items]
Business acquisition, percentage of voting interests acquired			100.00%
Cash			$ 920,697	[1]		$ 920,697
Number of acquired properties sold to third parties					3
Total real estate investments						(6,915)
Business combination, recognized identifiable assets acquired and liabilities assumed, real estate investment					2,029,725	2,029,725
Below-market leases			57,058	[1]	57,058	57,058
Goodwill	$ 2,304,880	$ 96,720	$ 89,875	[1]	$ 96,720	$ 96,720	$ 96,720

[1] As reported in the Company’s Annual Report on Form 10-K for the year ended December 31, 2013.