Summary of Significant Accounting Policies (Details) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended				12 Months Ended
	Jun. 30, 2014 segment	Jun. 30, 2014 Office Furniture, Fixtures and Equipment and Computer Hardware and Software [Member] Minimum [Member]	Jun. 30, 2014 Office Furniture, Fixtures and Equipment and Computer Hardware and Software [Member] Maximum [Member]	Jun. 30, 2014 Member Units [Member]	Dec. 31, 2013 Member Units [Member]	Jun. 30, 2014 Unconsolidated Joint Venture [Member] joint_venture property	Jun. 30, 2014 Unconsolidated Managed Real Estate Investment Trusts [Member]	May 19, 2014 Cole Credit Property Trust, Inc. [Member]
Schedule of Equity Method Investments [Line Items]
Antidilutive securities excluded from computation of earnings per share				24,771,215	9,591,173
Number of unconsolidated joint ventures						6
Number of owned properties						6
Carrying Amount of Investment						$ 98,100	$ 3,900	$ 5
Number of reportable segments	2
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life		5 years	7 years