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STOCKHOLDERS' EQUITY (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Impact of compensation cost on net earnings $ (620) $ (564) $ (1,231) $ (1,212)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for future awards (in shares) 4,521,024   4,521,024  
Weighted average grant date fair value [Roll Forward]        
Unrecognized compensation cost related to non-vested share-based compensation arrangements 6,883 6,545 6,883 6,545
Weighted-average period for unrecognized compensation     1 year 3 months 18 days  
Estimated share-based compensation expense for current fiscal year 3,900   3,900  
Stock splits and repurchase of common stock        
Number of shares authorized to be repurchased (in shares) 3,763,038   3,763,038  
Number of shares acquired under the stock repurchase plan and subsequently reissued (in shares) 2,033,700   2,033,700  
Number of shares acquired under stock repurchase plan (in shares)     23,212  
Treasury stock acquired, average cost (in dollars per share)     $ 41.53  
Stock Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     3 years  
Option activity, shares [Roll Forward]        
Outstanding at beginning of period (in shares)     2,514,000 2,955,000
Granted (in shares)     225,000 14,000
Exercised (in shares)     (92,000) (195,000)
Forfeited (in shares)     (5,000) (50,000)
Outstanding at end of period (in shares) 2,642,000 2,724,000 2,642,000 2,724,000
Exercisable at end of period (in shares) 2,068,000 2,037,000 2,068,000 2,037,000
Option activity, weighted average exercise price [Roll Forward]        
Outstanding at end of period (in dollars per share)     $ 14.68 $ 14.21
Granted (in dollars per share)     $ 29.11 $ 40.10
Exercised (in dollars per share)     $ 9.52 $ 11.85
Forfeited (in dollars per share)     $ 28.87 $ 24.47
Outstanding at end of period (in dollars per share) $ 16.06 $ 14.32 $ 16.06 $ 14.32
Exercisable, end of period (in dollars per share) $ 12.51 $ 10.67 $ 12.51 $ 10.67
Options, additional disclosures [Abstract]        
Aggregate intrinsic value, outstanding, beginning of period     65,043 57,930
Aggregate intrinsic value, outstanding, end of period 43,855 80,246 43,855 80,246
Aggregate intrinsic value, exercisable, end of period 41,588 67,422 41,588 67,422
Weighted average remaining contractual term, outstanding     5 years 4 months 24 days 5 years 10 months 24 days
Weighted average remaining contractual term, exercisable     4 years 6 months 5 years
Weighted-average fair value of options granted (in dollars per share) $ 10.37 $ 12.43 $ 9.75 $ 12.25
Total intrinsic value of stock options exercised 411 3,187 2,590 5,129
Weighted Average Assumptions [Abstract]        
Dividend yields (in hundredths)     0.50% 0.50%
Expected volatilities (in hundredths)     41.00% 36.00%
Risk-free interest rates (in hundredths)     0.80% 1.40%
Expected lives     4 years 7 months 6 days 4 years 6 months
Restricted Stock [Member]
       
Non-vested restricted stock activity [Roll Forward]        
Non-vested balance as of beginning of period (in shares)     354,000 363,000
Granted (in shares)     44,000 1,000
Vested (in shares)     (80,000) (7,000)
Forfeited (in shares)       (17,000)
Non-vested balance as of end of period (in shares) 318,000 340,000 318,000 340,000
Weighted average grant date fair value [Roll Forward]        
Non-vested balance as of beginning of period (in dollars per share)     $ 18.77 $ 17.66
Granted (in dollars per share)     $ 29.06 $ 40.88
Vested (in dollars per share)     $ 13.72 $ 12.41
Forfeited (in dollars per share)       $ 19.12
Non-vested balance as of end of period (in dollars per share) $ 21.48 $ 17.77 $ 21.48 $ 17.77
Restricted Stock [Member] | Employee [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     4 years  
Restricted Stock [Member] | Non-employee Director [Member] | Minimum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     4 years  
Restricted Stock [Member] | Non-employee Director [Member] | Maximum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     7 years  
ISO Plan [Member] | Stock Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expiration period of options granted     10 years  
Cost of Sales [Member]
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Impact of compensation cost on earnings component 145 146 289 291
Operating Expenses [Member]
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Impact of compensation cost on earnings component $ 827 $ 759 $ 1,657 $ 1,643