EQUITY (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2014 item	Dec. 31, 2013	Dec. 31, 2012
Stock options
EQUITY
Number of plans under award	2
Expiration term	10 years
Number of shares authorized for grant	1,500,000
Number of shares available for future grant	827,000
Shares
Outstanding at the beginning of the period (in shares)	393,776
Granted (in shares)	78,575
Exercised (in shares)	(121,060)
Cancelled, expired or forfeited (in shares)	(34,513)
Outstanding at the end of the period (in shares)	316,778	393,776
Exercisable at the end of the period (in shares)	85,507
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 22.52
Granted (in dollars per share)	$ 42.03
Exercised (in dollars per share)	$ 21.27
Cancelled, expired or forfeited (in dollars per share)	$ 21.77
Outstanding at the end of the period (in dollars per share)	$ 27.92	$ 22.52
Exercisable at the end of the period (in dollars per share)	$ 19.82
Aggregate Intrinsic Value
Outstanding at the end of the period (in dollars)	$ 3,866,000
Exercisable at the end of the period (in dollars)	1,736,000
Weighted Average Remaining Contractual Term
Outstanding at the end of the period	7 years 10 months 24 days
Exercisable at the end of the period	5 years 10 months 24 days
Additional disclosures
Weighted average grant date fair value (in dollars per share)	$ 9.78	$ 5.06	$ 4.03
Intrinsic value of stock options exercised	3,500,000	2,400,000	497,000
Significant weighted-average assumptions relating to the valuation of each option grant
Expected life	3 years 7 months 6 days	3 years 3 months 18 days	3 years 3 months 18 days
Expected volatility (as a percent)	36.00%	36.00%	39.00%
Risk-free interest rate (as a percent)	0.80%	0.40%	0.40%
Expected dividend yield (as a percent)	2.00%	3.40%	4.10%
Stock options | Minimum
EQUITY
Award vesting period from the date of grant	1 year
Stock options | Minimum | Non-employee directors
EQUITY
Vesting requirement condition, percentage of attendance in regularly scheduled board meetings	75.00%
Stock options | Maximum
EQUITY
Award vesting period from the date of grant	3 years
Restricted stock
EQUITY
Number of plans under award	2
Shares
Outstanding at the beginning of the period (in shares)	51,600
Granted (in shares)	27,750
Vested (in shares)	(23,208)
Cancelled, expired or forfeited (in shares)	(3,157)
Outstanding at the end of the period (in shares)	52,985	51,600
Weighted Average Grant Date Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 25.89
Granted (in dollars per share)	$ 43.81
Vested (in dollars per share)	$ 26.28
Cancelled, expired or forfeited (in dollars per share)	$ 28.98
Outstanding at the end of the period (in dollars per share)	$ 34.92	$ 25.89
Additional disclosures
Total fair value of restricted stock vested	975,000	299,000	413,000
Director Plan | Restricted stock
EQUITY
Common stock value that can be purchased	$ 75,000
Award vesting period from the date of grant	1 year
Number of shares authorized for grant	200,000
Number of shares available for future grant	59,000
Shares
Granted (in shares)	8,200
Director Plan | Restricted stock | Minimum | Non-employee directors
EQUITY
Vesting requirement condition, percentage of attendance in regularly scheduled board meetings	75.00%
Vesting requirement condition, percentage of attendance in regularly scheduled committee meetings that they are a member of	75.00%
Employee Plan | Restricted stock
EQUITY
Number of shares authorized for grant	200,000
Number of shares available for future grant	55,669
Shares
Granted (in shares)	19,550