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Real Estate Investments (Pro Forma) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
2014 Acquisitions [Member]      
Business Acquisition [Line Items]      
Pro forma revenues $ 1,853,014 $ 1,585,511  
Pro forma net (loss) attributable to stockholders $ (606,549) (478,093)  
2013 Acquisitions [Member]      
Business Acquisition [Line Items]      
Pro forma revenues   574,058 $ 467,434
Pro forma net (loss) attributable to stockholders   $ (75,132) $ (15,708)