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Shareholders' Equity (Initial Public Offering, Preferred Stock and Common Stock, Narrative) (Details) (USD $)
 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
May 21, 2012
Option Exchange Program
Dec. 31, 2012
Option Exchange Program
Aug. 10, 2009
Common Stock
Dec. 31, 2012
Common Stock
Dec. 31, 2011
Common Stock
Dec. 31, 2010
Common Stock
May 21, 2012
Stock Options
Option Exchange Program
Dec. 31, 2012
Restricted Stock
Dec. 31, 2011
Restricted Stock
May 21, 2012
Restricted Stock
Option Exchange Program
May 21, 2012
Restricted Stock
Option Exchange Program
Minimum
May 21, 2012
Restricted Stock
Option Exchange Program
Maximum
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           $ 85,000,000                  
Initial public offering, underwriting discounts           6,000,000                  
Initial public offering, issuance costs           4,200,000                  
Initial public offering, net proceeds           74,800,000                  
Initial public offering, number of shares common stock received in exchange for preferred stock           2                  
Preferred Stock [Abstract]                              
Preferred stock, shares authorized 20,000,000 20,000,000                          
Preferred stock, shares outstanding 0 0                          
Common Stock [Abstract]                              
Stock issued during period, compensation for services, shares             20,199 10,144 5,636            
Stock issued during period, compensation for services, value             78,000 59,000 56,000            
Option Exchange Program, expiration date       May 21, 2012                      
Stock options forfeited                   424,475          
Restricted stock granted                     286,453 149,320 147,828    
Award vesting period                           1 year 4 years
Share-based compensation 636,528 779,305 768,630   0                    
Unrecognized compensation cost related to share-based payments $ 1,400,000     $ 300,000