Summary of Significant Accounting Policies (Details) (USD $)	6 Months Ended
	Jun. 30, 2012 Employee MortgageLoan State PropertyAndMortgageLoan Property JointVenture sqft	Jun. 30, 2012 sqft State PropertyAndMortgageLoan Property JointVenture	Jun. 30, 2011	Dec. 31, 2011
Summary of Significant Accounting Policies [Abstract]
Real Estate, Gross	$ 2,887,598,000	$ 2,887,598,000
Number of Real Estate Investments	205	205
Number of states that the Company owns real estate in, whole units	28	28
Total number of company owned real estate properties	198	198
Gross Investment, Amount	1,266,000	1,266,000		1,266,000
Square footage of owned real estate properties	13,478,000	13,500,000
Number of Real Estate Investment in Unconsolidated Joint Venture	1	1
Approximate square feet for which Nationwide property management services provided by company	10,300,000	10,300,000
Number of construction mortgages loans	2	2
Taxable income to be distributed to stockholders	90.00%	90.00%
Number of employees covered by the Company's pension plan	3	3
Maximum Annual Benefits Payable Under Executive Retirement Plan		896,000
Defined Benefit Plan, Measurement Date	December 31	December 31
Gain from the deconsolidation		300,000
Net mortgage interest income		400,000
General and Administrative Overhead Expense		100,000
Financial support agreement payments		500,000
Condition to qualify as a REIT	must distribute at least 90% of its REIT taxable income each year to its stockholders and meet other requirements	must distribute at least 90% of its REIT taxable income each year to its stockholders and meet other requirements
Interest and penalties related to uncertain tax position		0	0
Goodwill for Impairment	$ 3,487,000	$ 3,487,000		$ 3,487,000