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Subsequent Events (Details) - Liberty Washington, LP [Member] - USD ($)
$ in Millions
Jul. 01, 2015
Jun. 30, 2015
Subsequent Event [Line Items]    
Equity Method Investment, Ownership Percentage   25.00%
Subsequent Event [Member]    
Subsequent Event [Line Items]    
Equity Method Investment, Ownership Percentage 25.00%  
Northern Virginia [Member] | Mortgages [Member] | Subsequent Event [Member]    
Subsequent Event [Line Items]    
Debt Instrument, Debt Default, Amount $ 46.4