Income Taxes and Distributions (Details) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2012 Number	Jun. 30, 2012 Number
Income Taxes And Distributions (Textuals) [Abstract]
Investments structured under RIDEA	6	6
Percentage of taxable income to be distributed to stockholders for federal tax purposes	90.00%
Percentage of capital gains on taxable income distributed to stockholders	100.00%
Percentage of federal excise tax on real estate investment trusts that do not distribute income	4.00%
Carryforwards expiration date	from 2012 through 2031
Expensed tax interest and penalties	$ 287,000	$ 502,000
Accrued tax interest and penalties	2,149,000	2,149,000
Liability for Uncertain Tax Positions	206,000	206,000
Reserved for uncertain tax positions	8,339,000	8,339,000
Subject to collection under the indemnification agreement, minimum	8,339,000	8,339,000
Subject to collection under the indemnification agreement, maximum	17,291,000	17,291,000
Additional Income Taxes and Distributions (Textuals) [Abstract]
Unrecognized Tax Benefits	6,468,000	6,468,000
Domestic Country [Member]
Additional Income Taxes and Distributions (Textuals) [Abstract]
Tax losses available for carryforward	1,356,000	1,356,000
State and Local Jurisdiction [Member]
Additional Income Taxes and Distributions (Textuals) [Abstract]
Tax losses available for carryforward	0	0
Genesis Acquisition [Member]
Additional Income Taxes and Distributions (Textuals) [Abstract]
Unrecognized Tax Benefits	$ 6,141,000	$ 6,141,000