STOCK AWARD PLANS (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
STOCK AWARD PLANS [Abstract]
Compensation cost	$ 3,551,000	$ 3,860,000	$ 8,824,000	$ 8,921,000
Income tax benefit	1,329,000	1,459,000	3,327,000	3,372,000
Share based Compensation Plans Combined Disclosure [Abstract]
Intrinsic value of stock options exercised			11,624,000	5,622,000
Tax benefit from stock options exercised			4,382,000	2,125,000
Intrinsic value of restricted stock vesting			14,021,000	9,969,000
Tax benefit from restricted stock vesting			5,286,000	3,768,000
Fair value of options vested			2,103,000	1,829,000
Fair value of restricted stock vested			14,021,000	9,969,000
Fair value of stock options granted (in dollars per share)			$ 36.05	$ 25.14
Fair value of stock options granted			4,226,000	4,185,000
Fair Value Assumptions [Abstract]
Dividend yield (in hundredths)			0.00%	0.00%
Average risk-free interest rate (in hundredths)			2.00%	1.10%
Stock price volatility (in hundredths)			33.00%	34.00%
Minimum [Member]
Fair Value Assumptions [Abstract]
Estimated option term			6 years	6 years
Maximum [Member]
Fair Value Assumptions [Abstract]
Estimated option term			7 years	7 years
Fifth Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, lower limit (in dollars per share)			$ 75.17
Employee Stock Award Plan [Member]
Stock Award Plan Information [Abstract]
Shares available for future grants (in shares)	2,538,874		2,538,874
Outstanding Non-Qualified or Nonincentive Stock Awards [Roll Forward]
Outstanding at Period Start, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)			379,604
Granted, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)			75,204
Exercised, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)			(117,677)
Forfeited, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)			(12,576)
Outstanding at Period End, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)	324,555		324,555
Weighted Average Exercise Price [Abstract]
Outstanding at Period Start, Weighted Average Exercise Price (in dollars per share)			$ 55.42
Granted, Weighted Average Exercise Price (in dollars per share)			$ 98.91
Exercised, Weighted Average Exercise Price (in dollars per share)			$ 41.72
Forfeited, Weighted Average Exercise Price (in dollars per share)			$ 68.89
Outstanding at Period End, Weighted Average Exercise Price (in dollars per share)	$ 69.94		$ 69.94
Unvested Restricted Stock Award Shares [Roll Forward]
Nonvested balance beginning of period, Unvested Restricted Stock Award Shares (in shares)			399,278
Granted, Unvested Restricted Stock Award Shares (in shares)			97,706
Vested, Unvested Restricted Stock Award Shares (in shares)			(141,700)
Forfeited, Unvested Restricted Stock Award Shares (in shares)			(31,589)
Nonvested balance end of period, Unvested Restricted Stock Award Shares (in shares)	323,695		323,695
Weighted Average Grant Date Fair Value Per Share [Abstract]
Nonvested balance beginning of period, Weighted Average Grant Date Fair Value Per Share (in dollars per share)			$ 54.92
Granted, Weighted Average Grant Date Fair Value Per Share (in dollars per share)			$ 97.46
Vested, Weighted Average Grant Date Fair Value Per Share (in dollars per share)			$ 45.62
Forfeited, Weighted Average Grant Date Fair Value Per Share (in dollars per share)			$ 62.69
Nonvested balance end of period, Weighted Average Grant Date Fair Value Per Share (in dollars per share)	$ 71.07		$ 71.07
Employee Stock Award Plan [Member] | First Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, upper limit (in dollars per share)			$ 36.35
Range of Exercise Prices, lower limit (in dollars per share)			$ 31.35
Options Outstanding [Abstract]
Number Outstanding (in shares)	16,910		16,910
Weighted Average Remaining Contractual Life (in years)			2 years 4 months 24 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 32.82		$ 32.82
Options Exercisable [Abstract]
Number Exercisable (in shares)	16,910		16,910
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 32.82		$ 32.82
Employee Stock Award Plan [Member] | Second Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, lower limit (in dollars per share)			$ 46.74
Options Outstanding [Abstract]
Number Outstanding (in shares)	56,629		56,629
Weighted Average Remaining Contractual Life (in years)			3 years 3 months 18 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 46.74		$ 46.74
Options Exercisable [Abstract]
Number Exercisable (in shares)	56,629		56,629
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 46.74		$ 46.74
Employee Stock Award Plan [Member] | Third Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, upper limit (in dollars per share)			$ 70.65
Range of Exercise Prices, lower limit (in dollars per share)			$ 65.28
Options Outstanding [Abstract]
Number Outstanding (in shares)	173,845		173,845
Weighted Average Remaining Contractual Life (in years)			4 years 10 months 24 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 68.38		$ 68.38
Options Exercisable [Abstract]
Number Exercisable (in shares)	84,545		84,545
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 67.57		$ 67.57
Employee Stock Award Plan [Member] | Fourth Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, upper limit (in dollars per share)			$ 96.85
Range of Exercise Prices, lower limit (in dollars per share)			$ 86.96
Options Outstanding [Abstract]
Number Outstanding (in shares)	37,730		37,730
Weighted Average Remaining Contractual Life (in years)			6 years 3 months 18 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 93.89		$ 93.89
Options Exercisable [Abstract]
Number Exercisable (in shares)	655		655
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 86.96		$ 86.96
Employee Stock Award Plan [Member] | Fifth Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, upper limit (in dollars per share)			$ 114.11
Range of Exercise Prices, lower limit (in dollars per share)			$ 101.46
Options Outstanding [Abstract]
Number Outstanding (in shares)	39,441		39,441
Weighted Average Remaining Contractual Life (in years)			6 years 4 months 24 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 103.12		$ 103.12
Options Exercisable [Abstract]
Number Exercisable (in shares)	0		0
Employee Stock Award Plan [Member] | Full Exercise Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, upper limit (in dollars per share)			$ 114.11
Range of Exercise Prices, lower limit (in dollars per share)			$ 31.35
Options Outstanding [Abstract]
Number Outstanding (in shares)	324,555		324,555
Weighted Average Remaining Contractual Life (in years)			4 years 9 months 18 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 69.94		$ 69.94
Aggregate Intrinsic Value, Options Outstanding	15,549,000		15,549,000
Options Exercisable [Abstract]
Number Exercisable (in shares)	158,739		158,739
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 56.52		$ 56.52
Aggregate Intrinsic Value, Options Exercisable	9,736,000		9,736,000
2000 Director Plan [Member]
Stock Award Plan Information [Abstract]
Term of grant			10 years
Vesting period			6 months
Shares available for future grants (in shares)	559,881		559,881
Outstanding Non-Qualified or Nonincentive Stock Awards [Roll Forward]
Outstanding at Period Start, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)			320,322
Granted, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)			42,000
Exercised, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)			(63,988)
Outstanding at Period End, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)	298,334		298,334
Weighted Average Exercise Price [Abstract]
Outstanding at Period Start, Weighted Average Exercise Price (in dollars per share)			$ 50.64
Granted, Weighted Average Exercise Price (in dollars per share)			$ 99.52
Exercised, Weighted Average Exercise Price (in dollars per share)			$ 39.08
Outstanding at Period End, Weighted Average Exercise Price (in dollars per share)	$ 60.01		$ 60.01
Unvested Restricted Stock Award Shares [Roll Forward]
Nonvested balance beginning of period, Unvested Restricted Stock Award Shares (in shares)			384
Granted, Unvested Restricted Stock Award Shares (in shares)			8,160
Vested, Unvested Restricted Stock Award Shares (in shares)			(960)
Nonvested balance end of period, Unvested Restricted Stock Award Shares (in shares)	7,584		7,584
Weighted Average Grant Date Fair Value Per Share [Abstract]
Nonvested balance beginning of period, Weighted Average Grant Date Fair Value Per Share (in dollars per share)			$ 75.65
Granted, Weighted Average Grant Date Fair Value Per Share (in dollars per share)			$ 99.52
Vested, Weighted Average Grant Date Fair Value Per Share (in dollars per share)			$ 89.97
Nonvested balance end of period, Weighted Average Grant Date Fair Value Per Share (in dollars per share)	$ 99.52		$ 99.52
2000 Director Plan [Member] | First Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, upper limit (in dollars per share)			$ 29.60
Range of Exercise Prices, lower limit (in dollars per share)			$ 20.28
Options Outstanding [Abstract]
Number Outstanding (in shares)	30,000		30,000
Weighted Average Remaining Contractual Life (in years)			2 years 2 months 12 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 25.87		$ 25.87
Options Exercisable [Abstract]
Number Exercisable (in shares)	30,000		30,000
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 25.87		$ 25.87
2000 Director Plan [Member] | Second Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, upper limit (in dollars per share)			$ 36.82
Range of Exercise Prices, lower limit (in dollars per share)			$ 35.17
Options Outstanding [Abstract]
Number Outstanding (in shares)	32,048		32,048
Weighted Average Remaining Contractual Life (in years)			1 year 6 months
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 36.09		$ 36.09
Options Exercisable [Abstract]
Number Exercisable (in shares)	32,048		32,048
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 36.09		$ 36.09
2000 Director Plan [Member] | Third Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, upper limit (in dollars per share)			$ 56.45
Range of Exercise Prices, lower limit (in dollars per share)			$ 41.24
Options Outstanding [Abstract]
Number Outstanding (in shares)	91,022		91,022
Weighted Average Remaining Contractual Life (in years)			4 years 6 months
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 51.87		$ 51.87
Options Exercisable [Abstract]
Number Exercisable (in shares)	91,022		91,022
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 51.87		$ 51.87
2000 Director Plan [Member] | Fourth Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, upper limit (in dollars per share)			$ 62.48
Range of Exercise Prices, lower limit (in dollars per share)			$ 61.89
Options Outstanding [Abstract]
Number Outstanding (in shares)	54,306		54,306
Weighted Average Remaining Contractual Life (in years)			6 years
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 62.37		$ 62.37
Options Exercisable [Abstract]
Number Exercisable (in shares)	54,306		54,306
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 62.37		$ 62.37
2000 Director Plan [Member] | Fifth Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, upper limit (in dollars per share)			$ 99.52
Options Outstanding [Abstract]
Number Outstanding (in shares)	90,958		90,958
Weighted Average Remaining Contractual Life (in years)			7 years 4 months 24 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 86.41		$ 86.41
Options Exercisable [Abstract]
Number Exercisable (in shares)	48,958		48,958
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 75.17		$ 75.17
2000 Director Plan [Member] | Full Exercise Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, upper limit (in dollars per share)			$ 99.52
Range of Exercise Prices, lower limit (in dollars per share)			$ 20.28
Options Outstanding [Abstract]
Number Outstanding (in shares)	298,334		298,334
Weighted Average Remaining Contractual Life (in years)			5 years 1 month 6 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 60.01		$ 60.01
Aggregate Intrinsic Value, Options Outstanding	17,257,000		17,257,000
Options Exercisable [Abstract]
Number Exercisable (in shares)	256,334		256,334
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 53.53		$ 53.53
Aggregate Intrinsic Value, Options Exercisable	16,487,000		16,487,000
Employee Stock Award Plan - Options Granted After to January 25, 2010 [Member]
Stock Award Plan Information [Abstract]
Term of grant			7 years
Vesting period			3 years
Employee Stock Award Plan - Options Granted Prior to January 25, 2010 [Member]
Stock Award Plan Information [Abstract]
Term of grant			5 years
Vesting period			3 years
Stock Options [Member]
Share based Compensation Plans Combined Disclosure [Abstract]
Unrecognized compensation cost related to unvested awards	3,528,000		3,528,000
Weighted average period of recognition in years			1 year 2 months 12 days
Restricted Stock [Member]
Share based Compensation Plans Combined Disclosure [Abstract]
Unrecognized compensation cost related to unvested awards	$ 18,370,000		$ 18,370,000
Weighted average period of recognition in years			2 years 9 months 18 days