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Income Taxes and Distributions (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Income Taxes And Distributions (Textuals) [Abstract]          
Percentage of taxable income to be distributed to stockholders for federal tax purposes 90.00%        
Percentage of net 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%        
Income tax provision $ 3,077,000 $ 836,000 $ 7,055,000 $ 3,754,000  
Deferred Tax Liabilities 10,388,000   10,388,000   1,419,000
Additional Income Taxes and Distributions (Textuals) [Abstract]          
Unrecognized Tax Benefits 6,327,000   6,327,000   6,098,000
Expensed tax interest and penalties 154,000   366,000    
Genesis Acquisition [Member]
         
Additional Income Taxes and Distributions (Textuals) [Abstract]          
Unrecognized Tax Benefits $ 5,916,000   $ 5,916,000