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Shareholders' Equity (Initial Public Offering, Preferred Stock and Common Stock, Narrative) (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Aug. 10, 2009
USD ($)
$ / shares
shares
Dec. 31, 2015
shares
Dec. 31, 2014
shares
Dec. 31, 2013
shares
Preferred Stock [Abstract]        
Preferred stock, shares authorized | shares   20,000,000    
Common stock        
Initial Public Offering [Abstract]        
Initial public offering, effective date Aug. 10, 2009      
Initial public offering, shares issued | shares 5,000,000      
Initial public offering, price per share | $ / shares $ 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      
Initial public offering, number of shares common stock received in exchange for preferred stock 2      
Common stock        
Common Stock [Abstract]        
Share-based compensation, shares | shares   86,102 15,300 19,743
Exercise of options and related tax benefit, shares | shares   3,409   36,758