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EQUITY-BASED INCENTIVE AWARDS (Details 2) (USD $)
 3 Months Ended 0 Months Ended 0 Months Ended 0 Months Ended 0 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Restricted Stock Units
Oct. 26, 2011
Restricted Stock Units 1
Dec. 31, 2013
Restricted Stock Units 1
Oct. 23, 2012
Restricted Stock Units 2
Dec. 31, 2013
Restricted Stock Units 2
Oct. 22, 2013
Restricted Stock Units 3
Dec. 31, 2013
Restricted Stock Units 3
Dec. 31, 2013
Restricted Stock Units 3
Vesting of awards equally in three anniversaries from the date of grant
Dec. 31, 2013
Restricted Stock Units 3
Vesting of awards equally in five anniversaries from the date of grant
Oct. 22, 2013
Restricted Stock Units 3
Minimum
Oct. 22, 2013
Restricted Stock Units 3
Maximum
Restricted stock units                          
Service period       36 months   36 months           36 months 60 months
Estimated fair value of award at grant date       $ 855,000   $ 935,000   $ 1,486,000          
Award outstanding at the end of the period (in shares)     33,200   5,300   10,000   17,900 14,000 3,900    
Fair value of non-vested awards at the end of the period         424,000   799,000   1,431,000        
Vested as of the balance sheet date (in shares)         10,600   5,000            
Direct cost to the recipients of the restricted stock units     0                    
Number of Shares                          
Nonvested restricted stock units at the beginning of the period (in shares)     29,600   5,300   10,000   17,900 14,000 3,900    
Granted (in shares)     17,900 15,900   15,000   17,900          
Vested (in shares)     (14,300)                    
Nonvested restricted stock units at the end of the period (in shares)     33,200   5,300   10,000   17,900 14,000 3,900    
Weighted Average Fair Value                          
Nonvested restricted stock units at the beginning of the period (in dollars per share)     $ 81.89                    
Granted (in dollars per share)     $ 83.03                    
Vested (in dollars per share)     $ 80.68                    
Nonvested restricted stock units at the end of the period (in dollars per share)     $ 79.93                    
All Equity-Based Awards (stock options and restricted stock units)                          
Total unamortized compensation expense 300,000 300,000                      
Compensation expense related to the amortization of all equity - based compensation awards $ 2,500,000 $ 1,900,000