SHAREHOLDERS' EQUITY, EXERCISE PRICE RANGE AND TREASURY STOCK (Details) (USD $)	12 Months Ended
	Dec. 31, 2014 Transaction	Dec. 31, 2013	Dec. 31, 2012 Transaction
Equity, Class of Treasury Stock [Line Items]
Number of separate transactions	2		41
Shares repurchased (in shares)	400	0	37,787
Cost of shares retired	$ 6,300		$ 622,000
Remaining authorized repurchase amount	$ 885,000
Range 10.93 to 13.11 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 10.93
Exercise price range, upper range limit (in dollars per share)	$ 13.11
Number of options outstanding, ending balance (in shares)	77,667
Options outstanding, weighted average remaining contractual life	6 years 4 months 24 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 12.46
Options exercisable, number of options exercisable at end of period (in shares)	6,667
Options exercisable, weighted average exercise price (in dollars per share)	$ 11.50
Range 13.12 to 15.29 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 13.12
Exercise price range, upper range limit (in dollars per share)	$ 15.29
Number of options outstanding, ending balance (in shares)	21,000
Options outstanding, weighted average remaining contractual life	0 years 1 month 6 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 15.22
Options exercisable, number of options exercisable at end of period (in shares)	21,000
Options exercisable, weighted average exercise price (in dollars per share)	$ 15.22
Range 15.30 to 17.48 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 15.30
Exercise price range, upper range limit (in dollars per share)	$ 17.48
Number of options outstanding, ending balance (in shares)	176,000
Options outstanding, weighted average remaining contractual life	5 years 10 months 24 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 16.11
Options exercisable, number of options exercisable at end of period (in shares)	33,001
Options exercisable, weighted average exercise price (in dollars per share)	$ 16.53
Range 17.49 to 19.66 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 17.49
Exercise price range, upper range limit (in dollars per share)	$ 19.66
Number of options outstanding, ending balance (in shares)	129,000
Options outstanding, weighted average remaining contractual life	4 years 7 months 6 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 18.25
Options exercisable, number of options exercisable at end of period (in shares)	79,000
Options exercisable, weighted average exercise price (in dollars per share)	$ 18.34
Range 19.67 to 21.85 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 19.67
Exercise price range, upper range limit (in dollars per share)	$ 21.85
Number of options outstanding, ending balance (in shares)	183,166
Options outstanding, weighted average remaining contractual life	1 year 10 months 24 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 20.24
Options exercisable, number of options exercisable at end of period (in shares)	183,166
Options exercisable, weighted average exercise price (in dollars per share)	$ 20.24
Range 10.93 to 21.85 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 10.93
Exercise price range, upper range limit (in dollars per share)	$ 21.85
Number of options outstanding, ending balance (in shares)	586,833
Options outstanding, weighted average remaining contractual life	4 years 2 months 12 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 17.36
Options exercisable, number of options exercisable at end of period (in shares)	322,834
Options exercisable, weighted average exercise price (in dollars per share)	$ 18.89
Minimum [Member]
Equity, Class of Treasury Stock [Line Items]
Average cost per share (in dollars per share)	$ 15.38		$ 15.75
Maximum [Member]
Equity, Class of Treasury Stock [Line Items]
Average cost per share (in dollars per share)	$ 15.49		$ 19.00