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Distributions (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Distributions                      
Minimum distribution of taxable income (as a percent)                 90.00%    
Ordinary taxable distribution                 $ 1.539 $ 1.370 $ 1.200
Return of capital                 $ 0.242 $ 0.295 $ 0.334
Unrecaptured Section 1250 gain                 $ 0.004   $ 0.034
Long term capital gain                 $ 0.005 $ 0.015 $ 0.012
Total $ 0.465 $ 0.455 $ 0.435 $ 0.435 $ 0.42 $ 0.42 $ 0.42 $ 0.42 $ 1.79 $ 1.68 $ 1.58