STOCK AWARD PLANS (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
STOCK AWARD PLANS [Abstract]
Compensation cost	$ 2,153,000	$ 2,134,000
Income tax benefit	816,000	807,000
Share based Compensation Plans Combined Disclosure [Abstract]
Intrinsic value of stock options exercised	6,102,000	2,227,000
Tax benefit from stock options exercised	2,313,000	842,000
Intrinsic value of restricted stock vesting	13,916,000	9,200,000
Tax benefit from restricted stock vesting	5,274,000	3,477,000
Unrecognized compensation cost related to unvested awards	4,275,000
Fair value of options vested	2,076,000	1,707,000
Fair value of restricted stock vested	13,916,000	9,200,000
Fair value of stock options granted (in dollars per share)	$ 34.20	$ 23.66
Fair value of stock options granted	2,503,000	2,592,000
Fair Value Assumptions [Abstract]
Dividend yield (in hundredths)	0.00%	0.00%
Average risk-free interest rate (in hundredths)	1.80%	1.00%
Stock price volatility (in hundredths)	33.00%	34.00%
Estimated option term	6 years	6 years
Sixth 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)	2,541,079
Elected director first grant vesting period	The options granted to a director when first elected vest immediately
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)	73,191
Exercised, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)	(45,409)
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)	394,810
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)	$ 98.49
Exercised, Weighted Average Exercise Price (in dollars per share)	$ 47.77
Forfeited, Weighted Average Exercise Price (in dollars per share)	$ 68.89
Outstanding at Period End, Weighted Average Exercise Price (in dollars per share)	$ 63.85
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)	91,735
Vested, Unvested Restricted Stock Award Shares (in shares)	(141,382)
Forfeited, Unvested Restricted Stock Award Shares (in shares)	(25,810)
Nonvested balance end of period, Unvested Restricted Stock Award Shares (in shares)	323,821
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)	$ 96.47
Vested, Weighted Average Grant Date Fair Value Per Share (in dollars per share)	$ 45.60
Forfeited, Weighted Average Grant Date Fair Value Per Share (in dollars per share)	$ 61.54
Nonvested balance end of period, Weighted Average Grant Date Fair Value Per Share (in dollars per share)	$ 70.23
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)	68,012
Weighted Average Remaining Contractual Life (in years)	2 years 10 months 24 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 32.62
Options Exercisable [Abstract]
Number Exercisable (in shares)	68,012
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 32.62
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)	73,496
Weighted Average Remaining Contractual Life (in years)	3 years 9 months 18 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 46.74
Options Exercisable [Abstract]
Number Exercisable (in shares)	73,496
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 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)	178,144
Weighted Average Remaining Contractual Life (in years)	5 years 3 months 18 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 68.35
Options Exercisable [Abstract]
Number Exercisable (in shares)	88,844
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 67.55
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
Weighted Average Remaining Contractual Life (in years)	6 years 9 months 18 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 93.89
Options Exercisable [Abstract]
Number Exercisable (in shares)	0
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 0
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)	$ 104.37
Range of Exercise Prices, lower limit (in dollars per share)	$ 101.46
Options Outstanding [Abstract]
Number Outstanding (in shares)	37,428
Weighted Average Remaining Contractual Life (in years)	6 years 10 months 24 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 102.53
Options Exercisable [Abstract]
Number Exercisable (in shares)	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)	$ 104.37
Range of Exercise Prices, lower limit (in dollars per share)	$ 31.35
Options Outstanding [Abstract]
Number Outstanding (in shares)	394,810
Weighted Average Remaining Contractual Life (in years)	4 years 10 months 24 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 63.85
Aggregate Intrinsic Value, Options Outstanding	14,812,000
Options Exercisable [Abstract]
Number Exercisable (in shares)	230,352
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 50.60
Aggregate Intrinsic Value, Options Exercisable	11,668,000
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)	610,041
Outstanding Non-Qualified or Nonincentive Stock Awards [Roll Forward]
Outstanding at Period Start, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)	320,322
Exercised, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)	(57,988)
Outstanding at Period End, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)	262,334
Weighted Average Exercise Price [Abstract]
Outstanding at Period Start, Weighted Average Exercise Price (in dollars per share)	$ 50.64
Exercised, Weighted Average Exercise Price (in dollars per share)	$ 37.29
Outstanding at Period End, Weighted Average Exercise Price (in dollars per share)	$ 53.60
Unvested Restricted Stock Award Shares [Roll Forward]
Nonvested balance beginning of period, Unvested Restricted Stock Award Shares (in shares)	384
Vested, Unvested Restricted Stock Award Shares (in shares)	(384)
Nonvested balance end of period, Unvested Restricted Stock Award Shares (in shares)	0
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
Vested, Weighted Average Grant Date Fair Value Per Share (in dollars per share)	$ 75.65
Nonvested balance end of period, Weighted Average Grant Date Fair Value Per Share (in dollars per share)	$ 0
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
Weighted Average Remaining Contractual Life (in years)	3 years 6 months
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 25.87
Options Exercisable [Abstract]
Number Exercisable (in shares)	30,000
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 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
Weighted Average Remaining Contractual Life (in years)	2 years 7 months 6 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 36.09
Options Exercisable [Abstract]
Number Exercisable (in shares)	32,048
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 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)	97,022
Weighted Average Remaining Contractual Life (in years)	6 years 1 month 6 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 52.16
Options Exercisable [Abstract]
Number Exercisable (in shares)	97,022
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 52.16
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
Weighted Average Remaining Contractual Life (in years)	8 years 2 months 12 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 62.37
Options Exercisable [Abstract]
Number Exercisable (in shares)	54,306
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 62.37
2000 Director Plan [Member] | Sixth Price Range [Member]
Options Outstanding [Abstract]
Number Outstanding (in shares)	48,958
Weighted Average Remaining Contractual Life (in years)	9 years 1 month 6 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 75.17
Options Exercisable [Abstract]
Number Exercisable (in shares)	48,958
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 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)	$ 75.17
Range of Exercise Prices, lower limit (in dollars per share)	$ 20.28
Options Outstanding [Abstract]
Number Outstanding (in shares)	262,334
Weighted Average Remaining Contractual Life (in years)	6 years 4 months 24 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 53.60
Aggregate Intrinsic Value, Options Outstanding	12,501,000
Options Exercisable [Abstract]
Number Exercisable (in shares)	262,334
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 53.60
Aggregate Intrinsic Value, Options Exercisable	12,501,000
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]
Weighted average period of recognition in years	2 years
Restricted Stock [Member]
Share based Compensation Plans Combined Disclosure [Abstract]
Unrecognized compensation cost related to unvested awards	$ 21,478,000
Weighted average period of recognition in years	3 years 3 months 18 days