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Shareholders' Equity (Initial Public Offering, Preferred Stock and Common Stock, Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Aug. 10, 2009
Dec. 31, 2022
Dec. 31, 2021
Preferred Stock [Abstract]      
Preferred stock, shares authorized   20,000,000  
Preferred stock, shares outstanding   0 0
Common stock      
Initial Public Offering [Abstract]      
Initial public offering, effective date Aug. 10, 2009    
Initial public offering, shares issued 5,000,000    
Initial public offering, price per share $ 17.00    
Initial public offering, gross proceeds $ 85.0    
Initial public offering, underwriting discounts 6.0    
Initial public offering, issuance costs 4.2    
Initial public offering, net proceeds $ 74.8    
Common stock      
Common Stock [Abstract]      
Share-based compensation, shares   171,655 192,684