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STOCK AWARD PLANS (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
STOCK AWARD PLANS [Abstract]
Compensation cost	$ 2,961,000	$ 2,713,000	$ 5,545,000	$ 5,251,000
Income tax benefit	$ 1,110,000	$ 1,015,000	$ 2,079,000	1,964,000
Stock Award Plan Information [Abstract]
Term of grant			7 years
Vesting period			3 years
Share based Compensation Plans Combined Disclosure [Abstract]
Intrinsic value of stock options exercised			$ 266,000	2,555,000
Tax benefit from stock options exercised			100,000	956,000
Intrinsic value of restricted stock vesting			5,556,000	9,015,000
Tax benefit from restricted stock vesting			2,083,000	3,372,000
Fair value of options vested			2,495,000	2,194,000
Fair value of restricted stock vested			$ 5,556,000	$ 9,015,000
Fair value of stock options granted (in dollars per share)			$ 17.30	$ 25.18
Fair value of stock options granted			$ 3,231,000	$ 2,893,000
Employee Stock Award Plan [Member]
Stock Award Plan Information [Abstract]
Shares available for future grants (in shares)	1,983,293		1,983,293
Unvested Restricted Stock Award Shares [Roll Forward]
Nonvested balance beginning of period, Unvested Restricted Stock Award Shares (in shares)			311,727
Granted, Unvested Restricted Stock Award Shares (in shares)			190,150
Vested, Unvested Restricted Stock Award Shares (in shares)			(104,781)
Forfeited, Unvested Restricted Stock Award Shares (in shares)			(18,001)
Nonvested balance end of period, Unvested Restricted Stock Award Shares (in shares)	379,095		379,095
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)			$ 75.73
Granted, Weighted Average Grant Date Fair Value Per Share (in dollars per share)			53.55
Vested, Weighted Average Grant Date Fair Value Per Share (in dollars per share)			69.94
Forfeited, Weighted Average Grant Date Fair Value Per Share (in dollars per share)			76.82
Nonvested balance end of period, Weighted Average Grant Date Fair Value Per Share (in dollars per share)	$ 66.15		66.15
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			7 months 6 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, upper limit (in dollars per share)			51.23
Range of Exercise Prices, lower limit (in dollars per share)			$ 46.74
Options Outstanding [Abstract]
Number Outstanding (in shares)	212,335		212,335
Weighted Average Remaining Contractual Life			5 years 3 months 18 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 50.03		$ 50.03
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)			74.99
Range of Exercise Prices, lower limit (in dollars per share)			$ 64.89
Options Outstanding [Abstract]
Number Outstanding (in shares)	304,500		304,500
Weighted Average Remaining Contractual Life			4 years 6 months
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 70.32		$ 70.32
Options Exercisable [Abstract]
Number Exercisable (in shares)	204,074		204,074
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 69.56		$ 69.56
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)			$ 93.64
Options Outstanding [Abstract]
Number Outstanding (in shares)	33,987		33,987
Weighted Average Remaining Contractual Life			4 years 7 months 6 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 94.31		$ 94.31
Options Exercisable [Abstract]
Number Exercisable (in shares)	22,658		22,658
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 94.31		$ 94.31
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)	36,496		36,496
Weighted Average Remaining Contractual Life			4 years 6 months
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 103.22		$ 103.22
Options Exercisable [Abstract]
Number Exercisable (in shares)	24,778		24,778
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 103.22		$ 103.22
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)	604,228		604,228
Weighted Average Remaining Contractual Life			4 years 8 months 12 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 65.47		$ 65.47
Aggregate Intrinsic Value, Options Outstanding	$ 3,124,000		$ 3,124,000
Options Exercisable [Abstract]
Number Exercisable (in shares)	325,049		325,049
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 67.96		$ 67.96
Aggregate Intrinsic Value, Options Exercisable	$ 1,386,000		$ 1,386,000
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)	522,457		522,457
Outstanding Non-Qualified or Nonincentive Stock Awards [Roll Forward]
Outstanding at Period Start, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)			220,429
Granted, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)			0
Exercised, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)			(9,000)
Forfeited, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)			(6,000)
Outstanding at Period End, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)	205,429		205,429
Weighted Average Exercise Price [Abstract]
Outstanding at Period Start, Weighted Average Exercise Price (in dollars per share)			$ 64.37
Granted, Weighted Average Exercise Price (in dollars per share)			0
Exercised, Weighted Average Exercise Price (in dollars per share)			35.72
Forfeited, Weighted Average Exercise Price (in dollars per share)			99.52
Outstanding at Period End, Weighted Average Exercise Price (in dollars per share)	$ 64.60		$ 64.60
Unvested Restricted Stock Award Shares [Roll Forward]
Nonvested balance beginning of period, Unvested Restricted Stock Award Shares (in shares)			1,791
Granted, Unvested Restricted Stock Award Shares (in shares)			23,074
Vested, Unvested Restricted Stock Award Shares (in shares)			(2,138)
Nonvested balance end of period, Unvested Restricted Stock Award Shares (in shares)	22,727		22,727
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)			$ 68.73
Granted, Weighted Average Grant Date Fair Value Per Share (in dollars per share)			64.89
Vested, Weighted Average Grant Date Fair Value Per Share (in dollars per share)			68.11
Nonvested balance end of period, Weighted Average Grant Date Fair Value Per Share (in dollars per share)	$ 64.89		64.89
2000 Director Plan [Member] | First 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)			$ 29.60
Options Outstanding [Abstract]
Number Outstanding (in shares)	21,000		21,000
Weighted Average Remaining Contractual Life			1 year 4 months 24 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 32.69		$ 32.69
Options Exercisable [Abstract]
Number Exercisable (in shares)	21,000		21,000
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 32.69		$ 32.69
2000 Director Plan [Member] | Second 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)	71,276		71,276
Weighted Average Remaining Contractual Life			3 years 1 month 6 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 52.34		$ 52.34
Options Exercisable [Abstract]
Number Exercisable (in shares)	71,276		71,276
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 52.34		$ 52.34
2000 Director Plan [Member] | Third 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)	41,153		41,153
Weighted Average Remaining Contractual Life			5 years 3 months 18 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 62.34		$ 62.34
Options Exercisable [Abstract]
Number Exercisable (in shares)	41,153		41,153
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 62.34		$ 62.34
2000 Director Plan [Member] | Fourth 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)			$ 75.17
Options Outstanding [Abstract]
Number Outstanding (in shares)	72,000		72,000
Weighted Average Remaining Contractual Life			6 years 2 months 12 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 87.35		$ 87.35
Options Exercisable [Abstract]
Number Exercisable (in shares)	72,000		72,000
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 87.35		$ 87.35
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)			$ 29.60
Options Outstanding [Abstract]
Number Outstanding (in shares)	205,429		205,429
Weighted Average Remaining Contractual Life			4 years 6 months
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 64.60		$ 64.60
Aggregate Intrinsic Value, Options Outstanding	$ 1,345,000		$ 1,345,000
Options Exercisable [Abstract]
Number Exercisable (in shares)	205,429		205,429
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 64.60		$ 64.60
Aggregate Intrinsic Value, Options Exercisable	$ 1,345,000		$ 1,345,000
Stock Options [Member]
Share based Compensation Plans Combined Disclosure [Abstract]
Unrecognized compensation cost related to unvested awards	$ 4,738,000		$ 4,738,000
Weighted average period of recognition in years			1 year 10 months 24 days
Fair Value Assumptions [Abstract]
Dividend yield			0.00%	0.00%
Average risk-free interest rate			1.50%	1.30%
Stock price volatility			30.00%	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)			430,432
Granted, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)			186,706
Forfeited, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)			(12,910)
Outstanding at Period End, Outstanding Non-Qualified or Nonincentive Stock Awards (in shares)	604,228		604,228
Weighted Average Exercise Price [Abstract]
Outstanding at Period Start, Weighted Average Exercise Price (in dollars per share)			$ 71.01
Granted, Weighted Average Exercise Price (in dollars per share)			53.50
Forfeited, Weighted Average Exercise Price (in dollars per share)			77.35
Outstanding at Period End, Weighted Average Exercise Price (in dollars per share)	$ 65.47		$ 65.47
Restricted Stock [Member]
Share based Compensation Plans Combined Disclosure [Abstract]
Unrecognized compensation cost related to unvested awards	$ 22,948,000		$ 22,948,000
Weighted average period of recognition in years			3 years 7 months 6 days

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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