Acquisitions of CapLease, Cole and CCPT - CapLease Acquisition (Details) (USD $)	0 Months Ended
	Nov. 05, 2013		Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Identifiable liabilities assumed at fair value:
Goodwill			$ 1,894,794,000	$ 92,789,000	$ 0
CapLease [Member]
Business Acquisition [Line Items]
Fair value of consideration given- cash	920,697,000
Identifiable assets acquired at fair value:
Land	235,843,000
Buildings, fixtures and improvements	1,596,481,000
Land and construction in process	12,352,000
Acquired intangible lease assets	191,964,000
Total real estate investments	2,036,640,000
Cash and cash equivalents	41,799,000
Investment securities	60,730,000
Loans held for investment	26,457,000
Restricted cash	29,119,000
Deferred costs and other assets, net	21,574,000
Total identifiable assets acquired	2,216,319,000
Identifiable liabilities assumed at fair value:
Mortgage notes payable	1,010,171,000
Secured credit facility	121,000,000
Other debt	114,208,000
Below-market leases	57,058,000
Derivative liabilities	158,000
Accounts payable and accrued expenses	49,291,000
Deferred rent, derivative and other liabilities	8,619,000
Total liabilities assumed	1,360,505,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Liabilities	(27,339,000)
Non-controlling interests	567,000
Net identifiable assets acquired	855,247,000
Goodwill	65,450,000
Mortgage notes payable	(27,339,000)
Goodwill	(27,339,000)
Net identifiable assets acquired by Company	27,339,000
Scenario, Previously Reported [Member] | CapLease [Member]
Business Acquisition [Line Items]
Fair value of consideration given- cash	920,697,000	[1]
Identifiable assets acquired at fair value:
Land	235,843,000	[1]
Buildings, fixtures and improvements	1,596,481,000	[1]
Land and construction in process	12,352,000	[1]
Acquired intangible lease assets	191,964,000	[1]
Total real estate investments	2,036,640,000	[1]
Cash and cash equivalents	41,799,000	[1]
Investment securities	60,730,000	[1]
Loans held for investment	26,457,000	[1]
Restricted cash	29,119,000	[1]
Deferred costs and other assets, net	21,574,000	[1]
Total identifiable assets acquired	2,216,319,000	[1]
Identifiable liabilities assumed at fair value:
Mortgage notes payable	1,037,510,000	[1]
Secured credit facility	121,000,000	[1]
Other debt	114,208,000	[1]
Below-market leases	57,058,000	[1]
Derivative liabilities	158,000	[1]
Accounts payable and accrued expenses	49,291,000	[1]
Deferred rent, derivative and other liabilities	8,619,000	[1]
Total liabilities assumed	1,387,844,000	[1]
Non-controlling interests	567,000	[1]
Net identifiable assets acquired	827,908,000	[1]
Goodwill	$ 92,789,000	[1]

[1] As reported in Amendment No. 2 to the Company’s Annual Report on Form 10-K/A for the year ended December 31, 2013 filed with the SEC on March 2, 2015 (the “Amended 10-K”).