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Shareholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Oct. 21, 2016
Aug. 01, 2016
Sep. 30, 2016
Dec. 31, 2015
Class Of Stock [Line Items]        
Common stock, shares issued     85,333,000 85,049,000
Dividends payable, date declared     Oct. 25, 2016  
Dividends payable, date to be paid     Nov. 21, 2016  
Dividends payable, date of record     Nov. 11, 2016  
Subsequent Event [Member]        
Class Of Stock [Line Items]        
Common stock, dividends declared $ 0.05      
Subsequent Event [Member] | Series B [Member]        
Class Of Stock [Line Items]        
Preferred stock dividends declared $ 0.453125      
Forward Sales Agreement [Member]        
Class Of Stock [Line Items]        
Common stock, shares issued   5,750,000    
Public offering, estimated net proceeds   $ 44.2