STOCK PLANS (Summary Non-Vested Restricted Stock Activity) (Details) - Restricted stock awards - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Shares
Balance at beginning of year (in shares)	49,490	115,316	336,808
Shares granted	20,476	14,927	14,464
Shares vested (in shares)	(20,745)	(80,753)	(224,021)
Shares forfeited	(4,592)	0	(11,935)
Balance at end of year (in shares)	44,629	49,490	115,316
Weighted Average Grant Date Fair Value
Balance at beginning of year, weighted average grant date fair value (in dollars per share)	$ 60.14	$ 39.55	$ 28.49
Shares granted, weighted average grant date fair value (in dollars per share)	53.94	66.32	70.88
Shares vested, weighted average grant date fair value (in dollars per share)	49.37	31.88	25.68
Shares forfeited, weighted average grant date fair value (in dollars per share)	64.61	0.00	25.76
Balance at end of year, weighted average grant date fair value (in dollars per share)	$ 61.84	$ 60.14	$ 39.55