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Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Fourth Quarter Dividend Declaration On October 31, 2017, the Board of Directors of Piedmont declared dividends for the fourth quarter 2017 in the amount of $0.21 per common share outstanding to stockholders of record as of the close of business on November 24, 2017. Such dividends are to be paid on January 4, 2018.