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Supplemental Detail for Certain Components of Consolidated Balance Sheets - Distributions Payable (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Distributions payable    
Declared distributions $ 52,483 $ 50,344
Noncontrolling interests    
Distributions payable    
Declared distributions 128 124
Common stock    
Distributions payable    
Declared distributions 50,098 47,963
Preferred stock    
Distributions payable    
Declared distributions $ 2,257 $ 2,257