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Shareholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Apr. 19, 2017
Aug. 01, 2016
Mar. 31, 2017
Dec. 31, 2016
Class Of Stock [Line Items]        
Common stock, shares issued     85,565,000 85,316,000
Dividends payable, date declared     Apr. 19, 2017  
Dividends payable, date to be paid     May 22, 2017  
Dividends payable, date of record     May 12, 2017  
Subsequent Event [Member]        
Class Of Stock [Line Items]        
Common stock, dividends declared $ 0.05      
Series B [Member]        
Class Of Stock [Line Items]        
Dividend rate percentage     7.25%  
Liquidation preference, per share     $ 25.00 $ 25.00
Redemption price per share     $ 25.00  
Redemption date     May 22, 2017  
Series B [Member] | Subsequent Event [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