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STOCK AWARD PLANS (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
STOCK AWARD PLANS [Abstract]        
Compensation cost $ 3,296,000 $ 3,127,000 $ 8,841,000 $ 8,378,000
Income tax benefit 1,236,000 $ 1,161,000 3,315,000 3,125,000
Share based Compensation Plans Combined Disclosure [Abstract]        
Intrinsic value of stock options exercised     266,000 2,555,000
Tax benefit from stock options exercised     100,000 953,000
Intrinsic value of restricted stock vesting     5,587,000 9,055,000
Tax benefit from restricted stock vesting     2,095,000 3,378,000
Fair value of options vested     2,495,000 2,194,000
Fair value of restricted stock vested     $ 5,587,000 $ 9,055,000
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
Stock Options [Member]        
Share based Compensation Plans Combined Disclosure [Abstract]        
Unrecognized compensation cost related to unvested awards 4,080,000   $ 4,080,000  
Weighted average period of recognition in years     1 year 8 months 12 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
Restricted Stock [Member]        
Share based Compensation Plans Combined Disclosure [Abstract]        
Unrecognized compensation cost related to unvested awards $ 20,218,000   $ 20,218,000  
Weighted average period of recognition in years     3 years 4 months 24 days  
Employee Stock Award Plan [Member]        
Stock Award Plan Information [Abstract]        
Term of grant     7 years  
Vesting period     3 years  
Shares available for future grants (in shares) 1,987,792   1,987,792  
Employee Stock Award Plan [Member] | Stock Options [Member]        
Outstanding Non-Qualified or Nonincentive Stock Awards [Roll Forward]        
Outstanding at Period Start, (in shares)     430,432  
Granted (in shares)     186,706  
Forfeited (in shares)     (16,017)  
Outstanding at Period End (in shares) 601,121   601,121  
Weighted Average Exercise Price [Abstract]        
Outstanding at Period Start (in dollars per share)     $ 71.01  
Granted (in dollars per share)     53.50  
Forfeited (in dollars per share)     80.17  
Outstanding at Period End (in dollars per share) $ 65.33   65.33  
Employee Stock Award Plan [Member] | Stock Options [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     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] | Stock Options [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  
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] | Stock Options [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) 302,735   302,735  
Weighted Average Remaining Contractual Life     4 years 3 months 18 days  
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 70.29   $ 70.29  
Options Exercisable [Abstract]        
Number Exercisable (in shares) 202,309   202,309  
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 69.51   $ 69.51  
Employee Stock Award Plan [Member] | Stock Options [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 3 months 18 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] | Stock Options [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) 35,154   35,154  
Weighted Average Remaining Contractual Life     4 years 4 months 24 days  
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 102.60   $ 102.60  
Options Exercisable [Abstract]        
Number Exercisable (in shares) 23,436   23,436  
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 102.60   $ 102.60  
Employee Stock Award Plan [Member] | Stock Options [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) 601,121   601,121  
Weighted Average Remaining Contractual Life     4 years 6 months  
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 65.33   $ 65.33  
Aggregate Intrinsic Value, Options Outstanding $ 3,071,000   $ 3,071,000  
Options Exercisable [Abstract]        
Number Exercisable (in shares) 321,942   321,942  
Weighted Average Exercise Price, Options Exercisable (in dollars per share) $ 67.73   $ 67.73  
Aggregate Intrinsic Value, Options Exercisable $ 1,369,000   $ 1,369,000  
Employee Stock Award Plan [Member] | Restricted Stock [Member]        
Unvested Restricted Stock Award Shares [Roll Forward]        
Nonvested balance beginning of period (in shares)     311,727  
Granted (in shares)     190,150  
Vested (in shares)     (104,939)  
Forfeited (in shares)     (19,393)  
Nonvested balance end of period (in shares) 377,545   377,545  
Weighted Average Grant Date Fair Value Per Share [Abstract]        
Nonvested balance beginning of period (in dollars per share)     $ 75.73  
Granted (in dollars per share)     53.55  
Vested (in dollars per share)     69.95  
Forfeited (in dollars per share)     76.04  
Nonvested balance end of period (in dollars per share) $ 66.15   $ 66.15  
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  
2000 Director Plan [Member] | Stock Options [Member]        
Outstanding Non-Qualified or Nonincentive Stock Awards [Roll Forward]        
Outstanding at Period Start, (in shares)     220,429  
Exercised (in shares)     (9,000)  
Forfeited (in shares)     (6,000)  
Outstanding at Period End (in shares) 205,429   205,429  
Weighted Average Exercise Price [Abstract]        
Outstanding at Period Start (in dollars per share)     $ 64.37  
Exercised (in dollars per share)     35.72  
Forfeited (in dollars per share)     99.52  
Outstanding at Period End (in dollars per share) $ 64.60   64.60  
2000 Director Plan [Member] | Stock Options [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 1 month 6 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] | Stock Options [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     2 years 10 months 24 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] | Stock Options [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  
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] | Stock Options [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  
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] | Stock Options [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 2 months 12 days  
Weighted Average Exercise Price, Options Outstanding (in dollars per share) $ 64.60   $ 64.60  
Aggregate Intrinsic Value, Options Outstanding $ 1,321,000   $ 1,321,000  
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 $ 1,321,000   $ 1,321,000  
2000 Director Plan [Member] | Restricted Stock [Member]        
Unvested Restricted Stock Award Shares [Roll Forward]        
Nonvested balance beginning of period (in shares)     1,791  
Granted (in shares)     23,074  
Vested (in shares)     (2,485)  
Nonvested balance end of period (in shares) 22,380   22,380  
Weighted Average Grant Date Fair Value Per Share [Abstract]        
Nonvested balance beginning of period (in dollars per share)     $ 68.73  
Granted (in dollars per share)     64.89  
Vested (in dollars per share)     67.66  
Nonvested balance end of period (in dollars per share) $ 64.89   $ 64.89