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Noncontrolling Interest - Operating Partnership/Limited Partners' Equity - Preferred Units (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Temporary Equity [Line Items]    
Noncontrolling interest - operating partnership - 301,483 preferred units outstanding as of September 30, 2015 and December 31, 2014 $ 7,537 $ 7,537
Series I 2 [Member]    
Temporary Equity [Line Items]    
Noncontrolling interest - operating partnership - 301,483 preferred units outstanding as of September 30, 2015 and December 31, 2014 $ 7,537  
Units 301,483 301,483
Liquidation Preference $ 25  
Dividend Rate 6.25%