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Stock Based Compensation (Outstanding Employee Deferred Stock Awards) (Details) (USD $)
Sep. 30, 2014
Stock Awards [Member]
Dec. 31, 2013
Stock Awards [Member]
Sep. 30, 2014
Stock Awards 1, Granted April 4, 2012 [Member]
Apr. 04, 2012
Stock Awards 1, Granted April 4, 2012 [Member]
Sep. 30, 2014
Stock Awards 2, Granted April 4, 2012 [Member]
Apr. 04, 2012
Stock Awards 2, Granted April 4, 2012 [Member]
Sep. 30, 2014
Stock Awards, Granted April 2, 2013 [Member]
Apr. 02, 2013
Stock Awards, Granted April 2, 2013 [Member]
Sep. 30, 2014
Stock Awards 2, Granted April 2, 2013 [Member]
Apr. 02, 2013
Stock Awards 2, Granted April 2, 2013 [Member]
Sep. 30, 2014
Stock Awards, Granted January 2014 [Member]
Jan. 03, 2014
Stock Awards, Granted January 2014 [Member]
Sep. 30, 2014
Stock Awards, Granted May 2014 [Member]
May 09, 2014
Stock Awards, Granted May 2014 [Member]
Sep. 30, 2014
Stock Awards 2, Granted May 2014 [Member]
May 09, 2014
Stock Awards 2, Granted May 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Net Shares Granted       170,802 [1]   0 [1]   132,857 [1]   0 [1]   103,345 [1]   170,896 [1]   0 [1]
Grant Date Fair Value $ 19.47 $ 18.65   $ 17.53   $ 17.42   $ 19.47   $ 18.91   $ 16.45   $ 18.51   $ 22.00
Of the shares granted, % vested     25.00%       25.00%       20.00%   25.00%      
Of the shares granted, % expected to vest in one year     25.00%       25.00%       20.00%   25.00%      
Of the shares granted, % expected to vest in two years     25.00%       25.00%       20.00%   25.00%      
Of the shares granted, % expected to vest in three years     25.00%       25.00%       20.00%   25.00%      
Of the shares granted, % expected to vest in four years                     20.00%          
Unvested Shares 601,713 265,139 59,495   0 [2]   77,356   0 [2]   103,345   139,863   221,654 [2]  
[1] Amounts reflect the total grant, net of shares surrendered upon vesting to satisfy required minimum tax withholding obligations through September 30, 2014.
[2] Estimated based on Piedmont's cumulative total stockholder return ("TSR") for the respective performance period through September 30, 2014. Such estimates are subject to change in future periods based on both Piedmont's and its peers' stock performance and dividends paid.