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Stock Compensation Plans and Stock Based Compensation (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2011
Maximum [Member]
 
Stock Compensation Plans (Textual) [Abstract]  
Exercisable period for options acquired 5 years
Expiration period for options acquired 10 years
Minimum [Member]
 
Stock Compensation Plans (Textual) [Abstract]  
Exercisable period for options acquired 4 years
Expiration period for options acquired 5 years
2000 Plan [Member]
 
Stock Compensation Plans (Textual) [Abstract]  
Number of shares available for issuance under equity incentive plan 57,500,000
Restricted Stock [Member]
 
Stock Compensation Plans (Textual) [Abstract]  
Minimum vesting period 3 years
Maximum vesting period 4 years
1987 Plan [Member]
 
Stock Compensation Plans (Textual) [Abstract]  
Number of shares available for issuance under equity incentive plan 79,370,100
Expiration period from date of grant for options granted 7 years
Number of Shares which may be issued Pursuant to Restricted Stock Awards 5,000,000
Maximum exercisable period for options granted 5 years
Nonstatutory Stock Incentive Plans [Member]
 
Stock Compensation Plans (Textual) [Abstract]  
Expiration period from date of grant for options granted 7 years
1995 Directors' Plan [Member]
 
Stock Compensation Plans (Textual) [Abstract]  
Number of shares available for issuance under equity incentive plan 3,050,000
Number of trading days of which average of the closing price equals to exercise price 20
Term of options granted under Directors' Plan 10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year
Stock Options [Member]
 
Stock Compensation Plans (Textual) [Abstract]  
Total unrecognized compensation expense , net of estimates forfeitures 13,800,000
Weighted-average vesting period over which unrecognized compensation expense will be recognized 2.3
Restricted Stock Units (RSUs) [Member]
 
Stock Compensation Plans (Textual) [Abstract]  
Total unrecognized compensation expense , net of estimates forfeitures 48,800,000
Weighted-average vesting period over which unrecognized compensation expense will be recognized 1.9
Employee stock purchase plans [Member]
 
Stock Compensation Plans (Textual) [Abstract]  
Number of shares available for issuance under Employee Stock Purchase Plan 66,500,000
Offering period for common stock 6 months
Purchase period for common stock 6 months
January 2009 Employee Stock Purchase Plan ESPP [Member]
 
Stock Compensation Plans (Textual) [Abstract]  
Percentage of lower of fair market value at beginning or end of applicable offering period used for calculating price of common stock to be purchased by employees 85.00%
Maximum percentage of annual base earnings plus bonuses and commissions for which common stock can be purchased by employees 12.00%
Amount considered to find out difference between that amount & amount of company's common stock purchased by each participant on January 30, 2009 25,000
Employee Stock Purchase Plan with offering period commencing on August 1 , 2009 [Member]
 
Stock Compensation Plans (Textual) [Abstract]  
Maximum percentage of annual base earnings plus bonuses and commissions for which common stock can be purchased by employees 5.00%
Maximum amount for which common stock can be purchased by employees in any calendar year 7,058.82