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Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2015
Subsequent Event [Line Items]
Subsequent Events [Text Block]	Subsequent Events Subsequent to June 30, 2015, Liberty Washington, LP (a joint venture in which the Company holds a 25% interest) received a letter of default on a $46.4 million non-recourse mortgage loan related to certain properties within the joint venture in the Company's Northern Virginia segment.