STOCKHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future awards (in shares)	3,420,241
Weighted average grant date fair value [Abstract]
Unrecognized compensation cost related to non-vested shares	$ 14,017	$ 10,622
Weighted-average period of recognition for unrecognized compensation cost	2 years
Estimated share-based compensation expense for current fiscal year	$ 7,400
Stock splits and repurchase of common stock
Number of shares authorized to be repurchased (in shares)	3,763,038
Number of shares acquired under the stock repurchase plan (in shares)	2,135,650
Number of shares acquired under stock repurchase plan and subsequently reissued (in shares)	9,727
Treasury stock acquired, average cost (in dollars per share)	$ 63.27
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	$ (1,393)	$ (760)
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%	1.80%
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)	333,000	197,000
Exercised (in shares)	(39,000)	(192,000)
Forfeited (in shares)	0	(1,000)
Outstanding at end of period (in shares)	1,311,000	1,474,000
Exercisable at end of period (in shares)	781,000	1,040,000
Weighted Average Exercise Price [Abstract]
Outstanding at beginning of period (in dollars per share)	$ 37.29	$ 27.35
Granted (in dollars per share)	60.71	58.52
Exercised (in dollars per share)	34.11	16.52
Forfeited (in dollars per share)	0	45.08
Outstanding at end of period (in dollars per share)	43.36	32.93
Exercisable, end of period (in dollars per share)	$ 32.98	$ 24.75
Aggregate intrinsic value, outstanding, beginning of period	$ 23,927	$ 57,742
Aggregate intrinsic value, outstanding, end of period	24,481	33,736
Aggregate intrinsic value, exercisable, end of period	$ 22,692	$ 31,849
Weighted average remaining contractual term, outstanding	6 years 8 months 12 days	6 years 2 months 12 days
Weighted average remaining contractual term, exercisable	4 years 10 months 24 days	4 years 10 months 24 days
Weighted-average fair value of options granted (in dollars per share)	$ 18.46	$ 18.42
Total intrinsic value of stock options exercised	$ 1,015	$ 8,039
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	19,000
Vested (in shares)	(25,000)	(10,000)
Forfeited (in shares)	0	0
Non-vested balance as of end of period (in shares)	143,000	143,000
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	58.52
Vested (in dollars per share)	29.06	14.37
Forfeited (in dollars per share)	0	0
Non-vested balance as of end of period (in dollars per share)	$ 52.41	$ 42.53
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	24,000
Vested (in shares)	0	0
Forfeited (in shares)	0	0
Non-vested balance as of end of period (in shares)	41,000	24,000
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	58.78
Vested (in dollars per share)	0	0
Forfeited (in dollars per share)	0	0
Non-vested balance as of end of period (in dollars per share)	$ 61.03	$ 58.78
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	$ 212
Operating Expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Impact of compensation cost on earnings component	$ 1,937	$ 962