STOCKHOLDERS' EQUITY (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in cash flows from financing activities , excess tax benefits related to stock compensation	$ 2,862	$ 2,894	$ 4,230
Number of share-based compensation plans	1
Weighted average grant date fair value [Abstract]
Share-based compensation expense expected to be recognized over the next fiscal year	4,400
Stock splits and repurchase of common stock
Stock split conversion ratio	three-for-two
Number of shares authorized to be repurchased (in shares)	3,763,038
Number of shares acquired under stock repurchase plan (in shares)	2,054,168
Number of shares acquired under the stock repurchase plan and subsequently reissued (in shares)	43,680
Treasury stock acquired, average cost (in dollars per share)	$ 38.89
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Impact of compensation cost on net earnings	(2,469)	(2,340)	(2,449)
Stock options outstanding by price range [Abstract]
Shares outstanding (in shares)	2,543,000
Weighted average remaining contractual term of options outstanding (in years)	5 years 2 months 12 days
Weighted average exercise price of options outstanding (in dollars per share)	$ 16.87
Number of options exercisable (in shares)	2,155,000
Weighted average exercise price of options exercisable (in dollars per share)	$ 14.30
Exercise Price $4.51 - $17.28 [Member]
Stock options outstanding by price range [Abstract]
Range of exercise prices, minimum (in dollars per share)	$ 4.51
Range of exercise prices, maximum (in dollars per share)	$ 17.28
Shares outstanding (in shares)	1,695,000
Weighted average remaining contractual term of options outstanding (in years)	3 years 8 months 12 days
Weighted average exercise price of options outstanding (in dollars per share)	$ 11.34
Number of options exercisable (in shares)	1,695,000
Weighted average exercise price of options exercisable (in dollars per share)	$ 11.34
Exercise Price $21.39 - $32.21 [Member]
Stock options outstanding by price range [Abstract]
Range of exercise prices, minimum (in dollars per share)	$ 21.39
Range of exercise prices, maximum (in dollars per share)	$ 32.21
Shares outstanding (in shares)	781,000
Weighted average remaining contractual term of options outstanding (in years)	7 years 10 months 24 days
Weighted average exercise price of options outstanding (in dollars per share)	$ 27.18
Number of options exercisable (in shares)	457,000
Weighted average exercise price of options exercisable (in dollars per share)	$ 25.11
Exercise Price $33.81 - $45.09 [Member]
Stock options outstanding by price range [Abstract]
Range of exercise prices, minimum (in dollars per share)	$ 33.81
Range of exercise prices, maximum (in dollars per share)	$ 45.09
Shares outstanding (in shares)	67,000
Weighted average remaining contractual term of options outstanding (in years)	9 years 7 months 6 days
Weighted average exercise price of options outstanding (in dollars per share)	$ 36.86
Number of options exercisable (in shares)	3,000
Weighted average exercise price of options exercisable (in dollars per share)	$ 40.78
Cost of Sales [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Impact of compensation cost on earnings component	523	582	508
Operating Expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Impact of compensation cost on earnings component	3,383	3,110	3,484
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future awards (in shares)	4,433,950
Weighted Average Assumptions [Abstract]
Expected volatility (in hundredths)	40.60%	36.30%	39.50%
Expected term (in years)	4 years 7 months 6 days	4 years 6 months	4 years 3 months 18 days
Risk-free interest rate (in hundredths)	0.70%	1.40%	1.10%
Dividend yield (in hundredths)	0.50%	0.50%	0.60%
Vesting period (in years)	3 years
Stock Option Activity [Abstract]
Outstanding at beginning of year (in shares)	2,514,000	2,955,000	3,286,000
Granted (in shares)	276,000	15,000	291,000
Exercised (in shares)	(231,000)	(405,000)	(616,000)
Forfeited (in shares)	(16,000)	(51,000)	(6,000)
Outstanding at end of year (in shares)	2,543,000	2,514,000	2,955,000
Exercisable at end of year (in shares)	2,155,000	2,157,000	2,053,000
Weighted Average Exercise Price [Abstract]
Outstanding at beginning of year (in dollars per share)	$ 14.68	$ 14.21	$ 11.28
Granted (in dollars per share)	$ 30.35	$ 40.59	$ 32.13
Exercised (in dollars per share)	$ 8.24	$ 10.98	$ 7.04
Forfeited (in shares)	$ 28.53	$ 24.54	$ 17.83
Outstanding at end of year (in dollars per share)	$ 16.87	$ 14.68	$ 14.21
Exercisable, end of period (in dollars per share)	$ 14.30	$ 12.35	$ 10.53
Aggregate intrinsic value for outstanding stock options	49,845	65,043	57,930
Weighted average remaining contractual term for outstanding stock options (in years)	5 years 2 months 12 days
Aggregate intrinsic value for exercisable stock options outstanding	47,744
Weighted average remaining contractual term for exercisable stock options outstanding (in years)	4 years 6 months
Weighted-average fair value of options granted (in dollars per share)	$ 10.09	$ 12.37	$ 10.10
Total intrinsic value of stock options exercised	6,524	11,577	12,821
Restricted Stock [Member]
Non-vested restricted stock [Roll Forward]
Non-vested balance as of beginning of year (in shares)	354,000	363,000	418,000
Granted (in shares)	91,000	15,000	51,000
Vested (in shares)	(187,000)	(7,000)	(106,000)
Forfeited (in shares)	0	(17,000)	0
Non-vested balance as of end of year (in shares)	258,000	354,000	363,000
Weighted average grant date fair value [Abstract]
Non-vested balance as of beginning of year (in dollars per share)	$ 18.77	$ 17.66	$ 14.56
Granted (in dollars per share)	$ 32.72	$ 41.34	$ 32.26
Vested (in dollars per share)	$ 14.38	$ 12.41	$ 12.47
Forfeited (in dollars per share)	$ 0	$ 19.12	$ 0
Non-vested balance as of end of year (in dollars per share)	$ 26.88	$ 18.77	$ 17.66
Unrecognized compensation cost related to non-vested shares	$ 7,012	$ 5,398	$ 8,795
Weighted-average period of recognition for unrecognized compensation cost (in years)	2 years
Minimum [Member] | Restricted Stock [Member] | Employee [Member]
Weighted Average Assumptions [Abstract]
Vesting period (in years)	90 days
Minimum [Member] | Restricted Stock [Member] | Non-employee Director [Member]
Weighted Average Assumptions [Abstract]
Vesting period (in years)	4 years
Maximum [Member] | Restricted Stock [Member] | Employee [Member]
Weighted Average Assumptions [Abstract]
Vesting period (in years)	4 years
Maximum [Member] | Restricted Stock [Member] | Non-employee Director [Member]
Weighted Average Assumptions [Abstract]
Vesting period (in years)	7 years
1999 Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Initial number of common stock shares reserved for issuance (in shares)	600,000
Increase in the number of shares of common stock reserved for issuance (in shares)	600,000
1999 Stock Plan [Member] | Non-employee Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased under restricted stock purchase agreements, minimum (in shares)	1,000
Shares purchased under restricted stock purchase agreements, maximum (in shares)	20,000
1999 Stock Plan [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of option grants exercisable after one year (in hundredths)	20.00%
Percentage of option grants exercisable after two years (in hundredths)	60.00%
Percentage of option grants exercisable after three years (in hundredths)	100.00%
Expiration period of options granted (in years)	10 years
1999 Stock Plan [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased under restricted stock purchase agreements, minimum (in shares)	1,000
Shares purchased under restricted stock purchase agreements, maximum (in shares)	20,250
Shares purchased under restricted stock purchase agreements, purchase price, minimum (in dollars per share)	$ 0.02
Shares purchased under restricted stock purchase agreements, purchase price, maximum (in dollars per share)	$ 0.07
Amended 1999 Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Initial number of common stock shares reserved for issuance (in shares)	1,200,000
Second Amended 1999 Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Initial number of common stock shares reserved for issuance (in shares)	6,000,000
ISO Plan [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period of options granted (in years)	10 years
Non-Qualified Plan [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period of options granted (in years)	10 years