XML 43 R71.htm IDEA: XBRL DOCUMENT v2.4.0.6
Stock-Based Compensation Plans (Schedule of Stock Options Activity) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding, beginning of period, shares 1,276,158 1,905,470  
Options granted, shares 0 0  
Options exercised, shares (173,688) (503,411)  
Options forfeited or expired, shares (435,599) (125,901)  
Outstanding, end of period, shares 666,871 1,276,158 1,905,470
Options, exerciseable, end of period, shares 660,023    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Outstanding, beginning of period, weighted-average exercise price per share (in USD per share) $ 7.75 $ 6.45  
Options granted, weighted-average exercise price per share (in USD per share) $ 0 $ 0.00  
Options exercised, weighted-average exercise price per share (in USD per share) $ 3.55 $ 2.19  
Options forfeited or expired, weighted-average exercise price per share (in USD per share) $ 12.22 $ 10.24  
Outstanding, end of period, weighted-average exercise price per share (in USD per share) $ 5.93 $ 7.75 $ 6.45
Exercisable, end of period, weighted-average exercise price per share (in USD per share) $ 5.88    
Outstanding, end of period, weighted-average remaining contractual term 1 year 4 months 25 days 2 years 10 months 24 days 3 years 3 months 18 days
Exercisable, end of period, weighted-average remaining contractual term 1 year 4 months 25 days    
Outstanding, end of period, aggregate intrinsic value $ 132,348 $ 700,294 $ 2,853,707
Exercisable, end of period, aggregate intrinsic value $ 132,348