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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 9 Months Ended
Oct. 31, 2015
Apr. 30, 2015
Apr. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Subsequent events          
Net proceeds from issuance of common shares       $ 276,430 $ 528,615
Common stock          
Subsequent events          
Shares issued (in shares)   5,500,000 13,800,000    
Common stock purchased by the underwriters (in shares)     1,800,000    
Underwriting discounts and other offering costs   $ 1,400 $ 22,800    
Net proceeds from issuance of common shares   $ 276,400 $ 528,600    
Subsequent event | Common stock          
Subsequent events          
Common stock, dividends declared (in dollars per share) $ 0.1905        
Shares issued (in shares) 11,500,000        
Common stock purchased by the underwriters (in shares) 1,500,000        
Underwriting discounts and other offering costs $ 22,100        
Net proceeds from issuance of common shares $ 517,000        
Subsequent event | Class F Cumulative Redeemable Preferred Stock          
Subsequent events          
Preferred stock, dividends declared (in dollars per share) $ 0.138021