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Stock Based Compensation (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Stock Awards [Member]
Dec. 31, 2011
Stock Awards [Member]
Dec. 31, 2010
Stock Awards [Member]
Dec. 31, 2012
Stock Awards, Granted May 11, 2010 [Member]
May 11, 2010
Stock Awards, Granted May 11, 2010 [Member]
Dec. 31, 2012
Stock Awards 1, Granted May 24, 2010 [Member]
May 24, 2012
Stock Awards 1, Granted May 24, 2010 [Member]
May 24, 2011
Stock Awards 1, Granted May 24, 2010 [Member]
May 24, 2010
Stock Awards 1, Granted May 24, 2010 [Member]
Dec. 31, 2012
Stock Awards 2, Granted May 24, 2010 [Member]
May 24, 2012
Stock Awards 2, Granted May 24, 2010 [Member]
May 24, 2011
Stock Awards 2, Granted May 24, 2010 [Member]
May 24, 2010
Stock Awards 2, Granted May 24, 2010 [Member]
Dec. 31, 2012
Stock Awards, Granted April 5, 2011 [Member]
Apr. 05, 2012
Stock Awards, Granted April 5, 2011 [Member]
Apr. 05, 2011
Stock Awards, Granted April 5, 2011 [Member]
Dec. 31, 2012
Stock Awards 2, Granted April 5, 2011 [Member]
Apr. 05, 2011
Stock Awards 2, Granted April 5, 2011 [Member]
Dec. 31, 2012
Stock Awards 1, Granted April 4 2012 [Member]
Apr. 04, 2012
Stock Awards 1, Granted April 4 2012 [Member]
Apr. 05, 2011
Stock Awards 1, Granted April 4 2012 [Member]
Dec. 31, 2012
Stock Awards 2, Granted April 4 2012 [Member]
Apr. 05, 2011
Stock Awards 2, Granted April 4 2012 [Member]
Rollforward of deferred stock award activity                                              
Unvested Deferred Stock Awards as of January 1, 2012 511,203     5,266 [1]   52,964       17,457       74,496     0 [1]   168,710     0 [1]  
Deferred Stock Awards Granted During Fiscal Year 2012 229,135                                            
Adjustment to Estimated Future Grants of Performance Share Awards During the 2012 (159,474)                                            
Deferred Stock Awards Vested During Fiscal Year 2012 (255,258)                                            
Deferred Stock Awards Forfeited During Fiscal Year 2011 (in shares) (6,713)                                            
Unvested Deferred Stock Awards as of December 31, 2012 318,893 511,203   5,266 [1]   52,964       17,457       74,496     0 [1]   168,710     0 [1]  
Total Grant Date Fair Value of Shares Vested During the Year $ 5,331 $ 5,405 $ 4,789                                        
Share-based Liabilities Paid $ 798 [2] $ 851 [2] $ 0 [2]                                        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                                              
Unvested Deferred Stock Awards, Weighted-Average Grant Date Fair Value at beginning of year $ 21.67       $ 28.44       $ 18.71       $ 18.71     $ 19.40   $ 18.27     $ 17.49   $ 17.42
Deferred Stock Awards Granted During Fiscal Year 2012, Weighted-Average Grant Date Fair $ 17.53 $ 19.03 $ 22.54                                        
Adjustment to Estimated Future Grants of Performance Share Awards During the 2012, Weighted-Average Grant Date Fair $ 23.64                                            
Deferred Stock Awards Vested During Fiscal Year 2012, Weighted-Average Grant Date Fair Value $ 20.89                                            
Deferred Stock Awards Forfeited During Fiscal Year 2012, Weighted Average Grant Date Fair Value $ 18.52                                            
Unvested Deferred Stock Awards, Weighted-Average Grant Date Fair Value at end of year $ 18.41 $ 21.67     $ 28.44       $ 18.71       $ 18.71     $ 19.40   $ 18.27     $ 17.49   $ 17.42
Net Shares Granted         56,875 [3],[4]       161,148 [3]       40,085 [3]     128,986 [3]   0 [3]     209,876 [3]   0 [3]
Grant Date Fair Value $ 18.41 $ 21.67     $ 28.44       $ 18.71       $ 18.71     $ 19.40   $ 18.27     $ 17.49   $ 17.42
Unvested Shares (in shares) 318,893 511,203   5,266 [1]   52,964       17,457       74,496     0 [1]   168,710     0 [1]  
Of the shares granted, % vested             25.00% 25.00% 25.00%   33.33% 33.33%     25.00% 25.00%       25.00%      
Of the shares granted, % expected to vest within one year           25.00%       33.33%       25.00%         25.00%        
Of the shares granted, % expected to vest in two years                           25.00%         25.00%        
Of the shares granted, % expected to vest in three years                                     25.00%        
[1] Estimated based on Piedmont's cumulative total stockholder return relative to a predetermined peer group's cumulative total stockholder return for the respective performance period as of December 31, 2012. Such estimates are subject to change in future periods based on both Piedmont's and its peers' stock performance and dividends paid.
[2] Amounts reflect the issuance of performance share awards during the period.
[3] Amounts reflect the total grant, net of shares surrendered upon vesting to satisfy required minimum tax withholding obligations through December 31, 2012.
[4] Represents shares granted pursuant to the first and second interim performance periods ended December 31, 2010 and 2011, respectively.