Acquisition of CapLease and Cole - Cole Acquisition Assets Acquired and Liabilities Assumed (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Feb. 07, 2014 Cole Merger [Member]	Feb. 07, 2014 Real Estate Investment Segment [Member] Cole Merger [Member]	Feb. 07, 2014 Private Capital Management Cole Merger [Member]
Assets purchased, at fair value:
Land			$ 1,737,390	$ 1,737,390	$ 0
Buildings, fixtures and improvements			5,898,895	5,898,895	0
Land and construction in process			0	0	0
Acquired intangible lease assets			1,323,614	1,323,614	0
Total real estate investments			8,959,899	8,959,899	0
Investment in unconsolidated entities			103,965	100,659	3,307
Investment in marketable securities			151,197	151,197	0
Loans held for investment, net			72,326	72,326	0
Cash and cash equivalents			151,160	130,747	20,413
Restricted cash			15,704	15,704	0
Intangible assets			385,368	0	385,368
Deferred costs and other assets			95,974	45,081	50,893
Due from affiliates			3,301	0	3,301
Total identifiable assets acquired			9,938,894	9,475,613	463,282
Liabilities assumed, at fair value:
Mortgage notes payable, net			2,719,072	2,719,072	0
Credit facilities			1,309,000	1,309,000	0
Other debt			49,013	49,013	0
Below-market lease liabilities			212,377	212,377	0
Accounts payable and accrued expenses			133,909	73,441	60,468
Deferred rent, derivative and other liabilities			153,293	42,764	110,529
Dividends payable			6,271	6,271	0
Contingent consideration			51,979	3,606	48,373
Due to affiliates			44	0	44
Total liabilities assumed			4,634,958	4,415,544	219,414
Noncontrolling interests			20,996	20,996	0
Net identifiable assets acquired			5,282,940	5,039,073	243,868
Goodwill	2,287,122	102,419	2,184,703	1,628,571	556,132
Net identifiable assets acquired by Company			$ 7,467,643	$ 6,667,644	$ 800,000