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Subsequent Events Subsequent Events (Notes)	3 Months Ended
Subsequent Events Subsequent Events (Notes)	Mar. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS On April 4, 2017, we closed the purchase of Watergate 600, a 309,000 square foot office building in Washington, DC, for approximately $135.0 million in a transaction that was structured to include the issuance of operating units for $0.4 million of the purchase price. We primarily funded the purchase with borrowings on our Revolving Credit Facility