Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Carrying Amount of Investment	$ 5,061
Minimum [Member] | Office Furniture, Fixtures and Equipment and Computer Hardware and Software [Member]
Property, plant and equipment, useful life	5 years
Maximum [Member] | Office Furniture, Fixtures and Equipment and Computer Hardware and Software [Member]
Property, plant and equipment, useful life	7 years
Unconsolidated Managed Real Estate Investment Trusts [Member]
Carrying Amount of Investment	5,100
Unconsolidated Joint Venture [Member]
Number of unconsolidated joint ventures	6
Number of owned properties	6
Carrying Amount of Investment	$ 100,700