Acquisition of CapLease and Cole - CapLease Acquisition (Details) (USD $) In Thousands, unless otherwise specified			0 Months Ended			5 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Feb. 07, 2014 CapLease [Member]	Nov. 05, 2013 CapLease [Member]		Mar. 31, 2014 CapLease [Member]		Mar. 31, 2014 Purchase Price Allocation Adjustments [Member] CapLease [Member]
Business Acquisition [Line Items]
Payments to acquire businesses, gross			$ 181,774	$ 920,697	[1]	$ 920,697		$ 0
Assets purchased, at fair value:
Land				235,843	[1]	233,065		(2,778)
Buildings, fixtures and improvements				1,596,481	[1]	1,588,334		(8,147)
Land and construction in process				12,352	[1]	12,352		0
Acquired intangible lease assets				191,964	[1]	190,862		(1,102)
Total real estate investments				2,036,640	[1]	2,024,613		(12,027)
Cash and cash equivalents				41,799	[1]	41,799		0
Investment securities				60,730	[1]	60,730		0
Loans held for investment				26,457	[1]	26,457		0
Restricted cash				29,159	[1]	29,159		0
Prepaid expenses and other assets				21,564	[1]	21,564		0
Deferred costs				325	[1]	325		0
Total identifiable assets acquired				2,216,674	[1]	2,204,647		(12,027)
Liabilities assumed, at fair value:
Mortgage notes payable				1,037,510	[1]	1,037,510		0
Secured credit facility				121,000	[1]	121,000		0
Mortgage notes payable, net				114,208	[1]	114,208		0
Below-market leases						57,058	[1]	0
Derivative liabilities				158	[1]	158		0
Accounts payable and accrued expenses				46,484	[1]	47,001		517
Deferred rent, derivative and other liabilities				8,867	[1]	8,867		0
Total liabilities assumed				1,385,285	[1]	1,385,802		517
Noncontrolling interests				567	[1]	567		0
Net identifiable assets acquired by Company				830,822	[1]	818,278		(12,544)
Goodwill	$ 2,287,122	$ 102,419		$ 89,875	[1]	$ 102,419		$ 12,544

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