STOCKHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future awards (in shares)	3,419,191		3,419,191
Weighted average grant date fair value [Abstract]
Unrecognized compensation cost related to non-vested shares	$ 12,167	$ 12,146	$ 12,167	$ 12,146
Weighted-average period of recognition for unrecognized compensation cost			2 years
Estimated share-based compensation expense for current fiscal year	$ 7,300		$ 7,300
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 (in shares)			2,149,574
Number of shares acquired under stock repurchase plan and subsequently reissued (in shares)			23,651
Treasury stock acquired, average cost (in dollars per share)			$ 62.51
Treasury stock remaining (in shares)			0
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Impact of compensation cost on net earnings	$ (1,080)	$ (982)	$ (2,473)	$ (1,743)
Stock Options [Member]
Weighted Average Assumptions [Abstract]
Dividend yield			0.50%	0.60%
Expected volatility			34.00%	33.00%
Risk-free interest rate			1.20%	1.70%
Expected term			5 years	5 years 6 months
Vesting period			3 years
Stock Option Activity [Abstract]
Outstanding at beginning of period (in shares)			1,017,000	1,470,000
Granted (in shares)			338,000	207,000
Exercised (in shares)			(86,000)	(519,000)
Forfeited (in shares)			0	(12,000)
Outstanding at end of period (in shares)	1,269,000	1,146,000	1,269,000	1,146,000
Exercisable at end of period (in shares)	742,000	718,000	742,000	718,000
Weighted Average Exercise Price [Abstract]
Outstanding at beginning of period (in dollars per share)			$ 37.29	$ 27.35
Granted (in dollars per share)			60.78	58.34
Exercised (in dollars per share)			34.93	19.12
Forfeited (in dollars per share)			0	50.46
Outstanding at end of period (in dollars per share)	$ 43.71	$ 36.45	43.71	36.45
Exercisable, end of period (in dollars per share)	$ 33.03	$ 26.77	$ 33.03	$ 26.77
Aggregate intrinsic value, outstanding, beginning of period			$ 23,927	$ 57,742
Aggregate intrinsic value, outstanding, end of period	$ 20,626	$ 22,660	20,626	22,660
Aggregate intrinsic value, exercisable, end of period	$ 19,769	$ 20,785	$ 19,769	$ 20,785
Weighted average remaining contractual term, outstanding			6 years 7 months 6 days	6 years 7 months 6 days
Weighted average remaining contractual term, exercisable			4 years 10 months 24 days	5 years 2 months 12 days
Weighted-average fair value of options granted (in dollars per share)	$ 17.80	$ 17.07	$ 18.45	$ 18.35
Total intrinsic value of stock options exercised	$ 1,242	$ 12,244	$ 2,257	$ 20,284
Restricted Stock [Member]
Non-vested restricted stock [Roll Forward]
Non-vested balance as of beginning of period (in shares)			150,000	134,000
Granted (in shares)			18,000	76,000
Vested (in shares)			(52,000)	(11,000)
Forfeited (in shares)			0	0
Non-vested balance as of end of period (in shares)	116,000	199,000	116,000	199,000
Weighted average grant date fair value [Abstract]
Non-vested balance as of beginning of period (in dollars per share)			$ 47.46	$ 38.13
Granted (in dollars per share)			60.85	55.77
Vested (in dollars per share)			42.36	16.69
Forfeited (in dollars per share)			0	0
Non-vested balance as of end of period (in dollars per share)	$ 51.83	$ 46.11	$ 51.83	$ 46.11
Restricted Stock [Member] | Employee [Member]
Weighted Average Assumptions [Abstract]
Vesting period			4 years
Restricted Stock [Member] | Non-employee Director [Member]
Weighted Average Assumptions [Abstract]
Vesting period			4 years
Performance Shares [Member]
Non-vested restricted stock [Roll Forward]
Non-vested balance as of beginning of period (in shares)			20,000	0
Granted (in shares)			21,000	29,000
Vested (in shares)			0	0
Forfeited (in shares)			(4,000)	(9,000)
Non-vested balance as of end of period (in shares)	37,000	20,000	37,000	20,000
Weighted average grant date fair value [Abstract]
Non-vested balance as of beginning of period (in dollars per share)			$ 58.77	$ 0
Granted (in dollars per share)			63.15	58.77
Vested (in dollars per share)			0	0
Forfeited (in dollars per share)			60.87	58.77
Non-vested balance as of end of period (in dollars per share)	$ 61.04	$ 58.77	$ 61.04	$ 58.77
Performance Shares [Member] | Employee [Member]
Weighted Average Assumptions [Abstract]
Dividend yield			0.60%	0.50%
Expected volatility			32.00%	34.00%
Risk-free interest rate			0.88%	1.00%
Vesting period			3 years
Weighted average grant date fair value [Abstract]
Initial TSR			(6.60%)	(6.90%)
Cliff vest			100.00%
ISO Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period of options granted			10 years
Non-Qualified Plan [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	$ 260	$ 214	$ 520	$ 426
Operating Expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Impact of compensation cost on earnings component	$ 1,494	$ 1,298	$ 3,431	$ 2,260