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Stock Based Compensation (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Stock Awards [Member]
Dec. 31, 2012
Stock Awards [Member]
Dec. 31, 2011
Stock Awards [Member]
Dec. 31, 2013
Stock Awards, Granted April 5, 2011 [Member]
Apr. 05, 2011
Stock Awards, Granted April 5, 2011 [Member]
Dec. 31, 2013
Stock Awards 2, Granted April 5, 2011 [Member]
Apr. 05, 2011
Stock Awards 2, Granted April 5, 2011 [Member]
Dec. 31, 2013
Stock Awards 1, Granted April 4 2012 [Member]
Apr. 04, 2012
Stock Awards 1, Granted April 4 2012 [Member]
Dec. 31, 2013
Stock Awards 2, Granted April 4 2012 [Member]
Apr. 04, 2012
Stock Awards 2, Granted April 4 2012 [Member]
Dec. 31, 2013
Stock Awards, Granted April 2, 2013 [Member]
Apr. 02, 2013
Stock Awards, Granted April 2, 2013 [Member]
Dec. 31, 2013
Stock Awards 2, Granted April 2, 2013 [Member]
Apr. 02, 2013
Stock Awards 2, Granted April 2, 2013 [Member]
Rollforward of deferred stock award activity                              
Unvested Deferred Stock Awards as of December 31, 2012 318,893     36,835   0 [1]   110,184   0 [1]   118,120   0 [1]  
Deferred Stock Awards Granted During Fiscal Year 2013 161,257                            
Deferred Stock Awards Vested During Fiscal Year 2013 (209,284)                            
Deferred Stock Awards Forfeited During Fiscal Year 2013 (5,727)                            
Unvested Deferred Stock Awards as of December 31, 2013 265,139 318,893   36,835   0 [1]   110,184   0 [1]   118,120   0 [1]  
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 $ 18.41       $ 19.40   $ 18.27   $ 17.53   $ 17.42   $ 19.47   $ 18.91
Deferred Stock Awards Granted During Fiscal Year 2013, Weighted-Average Grant Date Fair $ 19.47 $ 17.53 $ 19.03                        
Deferred Stock Awards Vested During Fiscal Year 2013, Weighted-Average Grant Date Fair Value $ 18.91                            
Deferred Stock Awards Forfeited During Fiscal Year 2013, Weighted Average Grant Date Fair Value $ 18.62                            
Unvested Deferred Stock Awards, Weighted-Average Grant Date Fair Value at end of year $ 18.65 $ 18.41     $ 19.40   $ 18.27   $ 17.53   $ 17.42   $ 19.47   $ 18.91
Total Grant Date Fair Value of Shares Vested During the Year $ 3,957 $ 5,331 $ 5,405                        
Share-based Liabilities Paid $ 103 [2] $ 798 [2] $ 851 [2]                        
Net Shares Granted         116,116 [3]   0 [3]   190,134 [3]   0 [3]   146,679 [3]   0 [3]
Grant Date Fair Value $ 18.65 $ 18.41     $ 19.40   $ 18.27   $ 17.53   $ 17.42   $ 19.47   $ 18.91
Unvested Shares (in shares) 265,139 318,893   36,835   0 [1]   110,184   0 [1]   118,120   0 [1]  
Of the shares granted, % vested       25.00%       25.00%       25.00%      
Of the shares granted, % expected to vest within one year       25.00%       25.00%       25.00%      
Of the shares granted, % expected to vest in two years       25.00%       25.00%       25.00%      
Of the shares granted, % expected to vest in three years       25.00%       25.00%       25.00%      
[1] Estimated based on Piedmont's cumulative total stockholder return ("TSR") for the respective performance period through December 31, 2013. As of December 31, 2013, Piedmont's TSR for each of these respective plans was below threshold. 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 to employees, net of shares surrendered upon vesting to satisfy required minimum tax withholding obligations through December 31, 2013.