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Supplemental Detail for Certain Components of Consolidated Balance Sheets - Distributions Payable (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Distributions payable    
Declared distributions $ 57,885 $ 55,235
Noncontrolling interests    
Distributions payable    
Declared distributions 86 82
Common stock    
Distributions payable    
Declared distributions $ 57,799 52,896
Preferred stock    
Distributions payable    
Declared distributions   $ 2,257