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Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Second Quarter Dividend Declaration On May 2, 2017, the board of directors of Piedmont declared dividends for the second quarter 2017 in the amount of $0.21 per common share outstanding to stockholders of record as of the close of business on May 26, 2017. Such dividends are to be paid on June 16, 2017. Renewal of Stock Repurchase Plan Also on May 2, 2017, the board of directors of Piedmont re-authorized Piedmont's stock repurchase plan to permit the purchase of shares of common stock having an aggregate purchase price of up to $250 million between May 2, 2017 and May 2, 2019. This authorization supersedes and replaces Piedmont's previously authorized stock repurchase plan.