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Subsequent Events (Details) - USD ($)
$ in Thousands
9 Months Ended
Oct. 11, 2016
Sep. 30, 2016
Sep. 30, 2015
Subsequent Event [Line Items]      
Stock issuance costs   $ 4,266 $ 2,206
Subsequent Event      
Subsequent Event [Line Items]      
Number of shares issued (shares) 13,800,000    
Percent interest in share of series F cumulative redeemable preferred stock 1.00%    
Gross proceeds $ 345,000    
Stock issuance costs $ 10,722    
Series E Preferred Stock | Subsequent Event      
Subsequent Event [Line Items]      
Dividend rate 5.20%