Stockholders' Equity

9 Months Ended

Sep. 30, 2011

Stockholders' Equity Attributable to Parent [Abstract]

Stockholders' Equity

Stockholders' Equity

Effective June 30, 2011, the board of directors of Piedmont approved Articles Supplementary and Articles of Amendment to Piedmont's Third Articles of Amendment and Restatement. Together, the Articles Supplementary and Articles of Amendment (1) reclassified and designated all of Piedmont's authorized but unissued shares of Class B Common Stock as Class A Common Stock and then (2) changed the designation of Piedmont's Class A Common Stock to Common Stock. The Articles Supplementary and Articles of Amendment were each filed with the State Department of Assessments and Taxation of Maryland on June 30, 2011 and were effective upon such filing. As such, Piedmont has effected the reclassification of the authorized and outstanding Class A and B shares to Common Stock for all periods presented.