Annual report pursuant to Section 13 and 15(d)

Stock Based Compensation (Details 1)

v2.4.0.6
Stock Based Compensation (Details 1) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Range of Exercise Price - Lower Range Limit $ 8.06 $ 8.06 $ 8.06
Range of Exercise Price - Upper Range Limit $ 44.44 $ 44.44 $ 44.44
Stock Options Outstanding      
Number Outstanding (shares) 609,585    
Stock Options Exercisable      
Number Exercisable (shares) 471,760    
$8.06 - $15.98 [Member]
     
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Range of Exercise Price - Lower Range Limit $ 8.06    
Range of Exercise Price - Upper Range Limit $ 15.98    
Stock Options Outstanding      
Number Outstanding (shares) 209,768    
Weighted Average Contractual Life 2 years 4 months 18 days    
Weighted Average Exercise Price (in dollars per share) $ 14.81    
Stock Options Exercisable      
Number Exercisable (shares) 109,261    
Weighted Average Exercise Price (in dollars per share) $ 15.80    
$17.98 - $19.80 [Member]
     
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Range of Exercise Price - Lower Range Limit $ 17.98    
Range of Exercise Price - Upper Range Limit $ 19.80    
Stock Options Outstanding      
Number Outstanding (shares) 2,350    
Weighted Average Contractual Life 3 years 1 month 14 days    
Weighted Average Exercise Price (in dollars per share) $ 18.87    
Stock Options Exercisable      
Number Exercisable (shares) 0    
Weighted Average Exercise Price (in dollars per share) $ 0.00    
$19.90 - $19.90 [Member]
     
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Range of Exercise Price - Lower Range Limit $ 19.90    
Range of Exercise Price - Upper Range Limit $ 19.90    
Stock Options Outstanding      
Number Outstanding (shares) 139,840    
Weighted Average Contractual Life 2 years 4 months 18 days    
Weighted Average Exercise Price (in dollars per share) $ 19.90    
Stock Options Exercisable      
Number Exercisable (shares) 111,872    
Weighted Average Exercise Price (in dollars per share) $ 19.90    
$21.10 - $40.55 [Member]
     
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Range of Exercise Price - Lower Range Limit $ 21.10    
Range of Exercise Price - Upper Range Limit $ 40.55    
Stock Options Outstanding      
Number Outstanding (shares) 15,800    
Weighted Average Contractual Life 2 years 7 months 18 days    
Weighted Average Exercise Price (in dollars per share) $ 27.77    
Stock Options Exercisable      
Number Exercisable (shares) 8,800    
Weighted Average Exercise Price (in dollars per share) $ 32.33    
$42.82 - $44.44 [Member]
     
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Range of Exercise Price - Lower Range Limit $ 42.82    
Range of Exercise Price - Upper Range Limit $ 44.44    
Stock Options Outstanding      
Number Outstanding (shares) 241,827    
Weighted Average Contractual Life 1 year 0 months 29 days    
Weighted Average Exercise Price (in dollars per share) $ 42.83    
Stock Options Exercisable      
Number Exercisable (shares) 241,827    
Weighted Average Exercise Price (in dollars per share) $ 42.83