STOCKHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Impact of stock-based compensation cost on net earnings	$ (1,114)	$ (1,904)	$ (3,587)	$ (3,647)
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 Assumptions [Abstract]
Unrecognized compensation cost related to non-vested shares	$ 10,423	$ 9,239	$ 10,423	$ 9,239
Weighted-average period of recognition for unrecognized compensation cost			1 year 6 months
Estimated share-based compensation expense for current fiscal year	$ 7,300		$ 7,300
Repurchase of common stock [Abstract]
Number of shares authorized to be repurchased (in shares)	3,763,038		3,763,038
Aggregate number of shares repurchased since inception (in shares)	2,149,574		2,149,574
Number of shares remaining in treasury (in shares)	0		0		1,089
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
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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	209,000
Exercised (in shares)			(198,000)	(603,000)
Forfeited (in shares)			0	(12,000)
Outstanding at end of period (in shares)	1,157,000	1,064,000	1,157,000	1,064,000
Exercisable at end of period (in shares)	644,000	690,000	644,000	690,000
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)			31.03	19.73
Forfeited (in dollars per share)			0	50.46
Outstanding at end of period (in dollars per share)	$ 45.22	$ 37.52	45.22	37.52
Exercisable, end of period (in dollars per share)	$ 34.29	$ 29.23	$ 34.29	$ 29.23
Aggregate intrinsic value, outstanding, beginning of period			$ 23,927	$ 57,742
Aggregate intrinsic value, outstanding, end of period	$ 37,435	$ 24,747	37,435	24,747
Aggregate intrinsic value, exercisable, end of period	$ 27,857	$ 21,773	$ 27,857	$ 21,773
Weighted average remaining contractual term, outstanding			6 years 7 months 6 days	6 years 1 month 6 days
Weighted average remaining contractual term, exercisable			4 years 10 months 24 days	4 years 7 months 6 days
Weighted-average fair value of options granted (in dollars per share)	$ 0	$ 18.13	$ 18.45	$ 18.35
Total intrinsic value of stock options exercised	$ 4,423	$ 2,944	$ 6,680	$ 23,229
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
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)	(48,000)
Forfeited (in shares)			0	0
Non-vested balance as of end of period (in shares)	116,000	162,000	116,000	162,000
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	36.34
Forfeited (in dollars per share)			0	0
Non-vested balance as of end of period (in dollars per share)	$ 51.83	$ 47.01	$ 51.83	$ 47.01
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]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
Weighted Average Assumptions [Abstract]
Dividend yield			0.60%	0.50%
Expected volatility			32.00%	34.00%
Risk-free interest rate			0.88%	1.00%
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]
Stock-based compensation cost	$ 260	$ 214	$ 780	$ 640
Operating Expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation cost	$ 1,436	$ 2,756	$ 4,867	$ 5,016