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Shareholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
Oct. 19, 2018
Jan. 12, 2018
Sep. 30, 2018
Dec. 31, 2017
Class Of Stock [Line Items]        
Preferred stock, shares authorized     12,500,000  
Subsequent Event [Member]        
Class Of Stock [Line Items]        
Dividends payable, date declared Oct. 19, 2018      
Common stock, dividends declared $ 0.05      
Dividends payable, date to be paid Nov. 20, 2018      
Dividends payable, date of record Nov. 09, 2018      
Series B [Member]        
Class Of Stock [Line Items]        
Preferred stock, shares authorized     1,450,000 3,450,000
Preferred stock redeemed, shares   2,000,000    
Redemption price per share   $ 25.00    
Redemption price plus accrued and unpaid dividends amount   $ 50.0    
Series B [Member] | Subsequent Event [Member]        
Class Of Stock [Line Items]        
Preferred stock dividends declared $ 0.453125      
Series C [Member]        
Class Of Stock [Line Items]        
Preferred stock, shares authorized     6,450,000 6,450,000
Series C [Member] | Subsequent Event [Member]        
Class Of Stock [Line Items]        
Preferred stock dividends declared $ 0.406250