Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans (Details)

v2.4.0.6
Employee Benefit Plans (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Status of options related to Stock Plans      
Options Outstanding Beginning Balance 2,734    
Options Outstanding Exercised (625)    
Options Outstanding Forfeited (354)    
Options Outstanding Ending Balance 1,755 2,734  
Options Outstanding Exercisable 1,755    
Weighted Average Exercise Price Per Share, Beginning Balance $ 17.74    
Weighted Average Exercise Price Per Share, Exercised $ 6.33    
Weighted Average Exercise Price Per Share, Forfeited $ 32.68    
Weighted Average Exercise Price Per Share, Ending Balance $ 18.67 $ 17.74  
Weighted Average Exercise Price Per Share, Exercisable $ 18.67    
Weighted Average Remaining Contractual Term, Beginning balance 3 years 4 months 24 days 4 years 1 month 6 days  
Weighted Average Remaining Contractual Term, Ending balance 3 years 4 months 24 days 4 years 1 month 6 days  
Weighted Average Remaining Contractual Term, Exercisable 3 years 4 months 24 days    
Aggregate Intrinsic Value, Beginning Balance $ 10,715    
Aggregate Intrinsic Value, Ending Balance 8,372 10,715  
Aggregate Intrinsic Value, Exercisable 8,372    
Intrinsic Value of Options Exercised 7,427 4,039 2,235
Fair Value of Shares Vested $ 426 $ 444 $ 555
Maximum [Member]
     
Status of options related to Stock Plans      
Exercise Price Per Share, Beginning Balance $ 37.50    
Exercise Price Per Share, Exercised $ 19.23    
Exercise Price Per Share, Forfeited $ 37.50    
Exercise Price Per Share, Ending Balance $ 30.07    
Exercise Price Per Share, Exercisable $ 30.07    
Minimum [Member]
     
Status of options related to Stock Plans      
Exercise Price Per Share, Beginning Balance $ 1.81    
Exercise Price Per Share, Exercised $ 1.81    
Exercise Price Per Share, Forfeited $ 15.90    
Exercise Price Per Share, Ending Balance $ 1.81    
Exercise Price Per Share, Exercisable $ 1.81