STOCK AWARD PLANS (Details) (USD $)	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
STOCK AWARD PLANS [Abstract]
Compensation cost	$ 2,134,000	$ 1,906,000
Income tax benefit	807,000	728,000
Share based Compensation Plans Combined Disclosure [Abstract]
Intrinsic value of stock options exercised	2,227,000	860,000
Tax benefit from stock options exercised	842,000	329,000
Intrinsic value of restricted stock vestings	9,200,000	10,860,000
Tax benefit from restricted stock vesting	3,477,000	4,149,000
Fair value of options vested	1,707,000	1,312,000
Fair value of restricted stock vested	9,200,000	10,860,000
Fair value of stock options granted (in dollars per share)	$ 23.66	$ 21.62
Fair value of stock options granted	2,592,000	2,160,000
Employee Stock Award Plan [Member]
Stock Award Plan Information [Abstract]
Shares available for future grants (in shares)	2,673,605
Elected director first grant vesting period	The options granted to a director when first elected vest immediately.
Unvested Restricted Stock Award Shares [Roll Forward]
Nonvested balance beginning of period, Unvested Restricted Stock Award Shares (in shares)	418,128
Granted, Unvested Restricted Stock Award Shares (in shares)	128,125
Vested, Unvested Restricted Stock Award Shares (in shares)	(138,794)
Forfeited, Unvested Restricted Stock Award Shares (in shares)	(1,832)
Nonvested balance end of period, Unvested Restricted Stock Award Shares (in shares)	405,627
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)	$ 45.39
Granted, Weighted Average Grant Date Fair Value Per Share (in dollars per share)	$ 68.28
Vested, Weighted Average Grant Date Fair Value Per Share (in dollars per share)	$ 40.69
Forfeited, Weighted Average Grant Date Fair Value Per Share (in dollars per share)	$ 60.09
Nonvested balance end of period, Weighted Average Grant Date Fair Value Per Share (in dollars per share)	$ 54.16
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)	$ 32.56
Range of Exercise Prices, lower limit (in dollars per share)	$ 23.98
Options Outstanding [Abstract]
Number Outstanding (in shares)	99,898
Weighted Average Remaining Contractual Life (in years)	3 years 6 months
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 31.43
Options Exercisable [Abstract]
Number Exercisable (in shares)	99,898
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 31.43
Employee Stock Award Plan [Member] \| Second 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)	$ 34.40
Options Outstanding [Abstract]
Number Outstanding (in shares)	14,000
Weighted Average Remaining Contractual Life (in years)	1 year 7 months 6 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 34.96
Options Exercisable [Abstract]
Number Exercisable (in shares)	14,000
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 34.96
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)	$ 46.74
Options Outstanding [Abstract]
Number Outstanding (in shares)	100,569
Weighted Average Remaining Contractual Life (in years)	4 years 9 months 18 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 46.74
Options Exercisable [Abstract]
Number Exercisable (in shares)	67,039
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 46.74
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)	$ 70.65
Range of Exercise Prices, lower limit (in dollars per share)	$ 65.28
Options Outstanding [Abstract]
Number Outstanding (in shares)	209,466
Weighted Average Remaining Contractual Life (in years)	6 years 4 months 24 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 68.34
Options Exercisable [Abstract]
Number Exercisable (in shares)	33,299
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 65.80
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)	$ 70.65
Range of Exercise Prices, lower limit (in dollars per share)	$ 23.98
Options Outstanding [Abstract]
Number Outstanding (in shares)	423,933
Weighted Average Remaining Contractual Life (in years)	5 years 2 months 12 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 53.41
Aggregate Intrinsic Value, Options Outstanding	9,914,000
Options Exercisable [Abstract]
Number Exercisable (in shares)	214,236
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 41.79
Aggregate Intrinsic Value, Options Exercisable	7,500,000
2000 Director Plan [Member]
Stock Award Plan Information [Abstract]
Term of grant	10 years
Shares available for future grants (in shares)	675,535
Unvested Restricted Stock Award Shares [Roll Forward]
Nonvested balance beginning of period, Unvested Restricted Stock Award Shares (in shares)	348
Vested, Unvested Restricted Stock Award Shares (in shares)	(348)
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)	$ 62.99
Vested, Weighted Average Grant Date Fair Value Per Share (in dollars per share)	$ 62.99
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)	$ 17.88
Range of Exercise Prices, lower limit (in dollars per share)	$ 12.69
Options Outstanding [Abstract]
Number Outstanding (in shares)	24,000
Weighted Average Remaining Contractual Life (in years)	7 months 6 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 15.29
Options Exercisable [Abstract]
Number Exercisable (in shares)	24,000
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 15.29
2000 Director Plan [Member] \| Second 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)	36,000
Weighted Average Remaining Contractual Life (in years)	4 years 8 months 12 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 26.49
Options Exercisable [Abstract]
Number Exercisable (in shares)	36,000
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 26.49
2000 Director Plan [Member] \| Third 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)	56,036
Weighted Average Remaining Contractual Life (in years)	3 years 6 months
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 35.91
Options Exercisable [Abstract]
Number Exercisable (in shares)	56,036
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 35.91
2000 Director Plan [Member] \| Fourth 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)	145,596
Weighted Average Remaining Contractual Life (in years)	6 years 8 months 12 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 52.14
Options Exercisable [Abstract]
Number Exercisable (in shares)	145,596
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 52.14
2000 Director Plan [Member] \| Fifth 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)	60,306
Weighted Average Remaining Contractual Life (in years)	9 years 2 months 12 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 62.38
Options Exercisable [Abstract]
Number Exercisable (in shares)	60,306
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 62.38
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)	$ 62.48
Range of Exercise Prices, lower limit (in dollars per share)	$ 12.69
Options Outstanding [Abstract]
Number Outstanding (in shares)	321,938
Weighted Average Remaining Contractual Life (in years)	5 years 10 months 24 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 45.62
Aggregate Intrinsic Value, Options Outstanding	10,038,000
Options Exercisable [Abstract]
Number Exercisable (in shares)	321,938
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 45.62
Aggregate Intrinsic Value, Options Exercisable	10,038,000
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	4,231,000
Weighted average period of recognition in years	2 years
Fair Value Assumptions [Abstract]
Dividend yield (in hundredths)	0.00%	0.00%
Average risk-free interest rate (in hundredths)	1.00%	1.00%
Stock price volatility (in hundredths)	34.00%	33.00%
Estimated option term	6 years	6 years
Stock Options [Member] \| Employee Stock Award Plan [Member]
Outstanding Non-Qualified or Nonincentive Stock Awards [Roll Forward]
Outstanding at Period Start, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)	351,173
Granted, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)	109,560
Exercised, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)	(36,800)
Outstanding at Period End, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)	423,933
Weighted Average Exercise Price [Abstract]
Outstanding at Period Start, Weighted Average Exercise Price (in dollars per share)	$ 45.54
Granted, Weighted Average Exercise Price (in dollars per share)	$ 70.65
Exercised, Weighted Average Exercise Price (in dollars per share)	$ 29.61
Outstanding at Period End, Weighted Average Exercise Price (in dollars per share)	$ 53.41
Stock Options [Member] \| 2000 Director Plan [Member]
Outstanding Non-Qualified or Nonincentive Stock Awards [Roll Forward]
Outstanding at Period Start, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)	345,938
Exercised, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)	(24,000)
Outstanding at Period End, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)	321,938
Weighted Average Exercise Price [Abstract]
Outstanding at Period Start, Weighted Average Exercise Price (in dollars per share)	$ 45.84
Exercised, Weighted Average Exercise Price (in dollars per share)	$ 48.83
Outstanding at Period End, Weighted Average Exercise Price (in dollars per share)	$ 45.62
Restricted Stock [Member]
Share based Compensation Plans Combined Disclosure [Abstract]
Unrecognized compensation cost related to unvested awards	$ 20,722,000
Weighted average period of recognition in years	3 years 3 months 18 days

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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- Definition

The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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Net number of share options (or share units) granted during the period.

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- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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- Definition

The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

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No definition available.

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Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

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No definition available.

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- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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- Definition

Number of share options (or share units) exercised during the current period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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- Definition

Tax benefits realized from the exercise of stock options resulting in reductions in the entity's income taxes, which increases net cash provided by operating activities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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