STOCK BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2016

STOCK BASED COMPENSATION

Schedule of stock option activity

				Weighted
		Weighted		Average	Aggregate
	Number of	Average		Remaining	Intrinsic
	Options	Exercise		Contractual	Value
	Outstanding	Price		Life	(in 000’s)
Outstanding options at January 1, 2016	2,582,220	$	32.42
Options granted	36,500	$	61.27
Options exercised	(168,480)	$	19.00		$	7,619
Options canceled/forfeited	(5,440)	$	33.69
Outstanding options at March 31, 2016	2,444,800	$	33.78	4.99	$	80,880
Exercisable options at March 31, 2016	966,100	$	27.24	3.62	$	38,280
				Weighted
		Weighted		Average	Aggregate
	Number of	Average		Remaining	Intrinsic
	Options	Exercise		Contractual	Value
	Outstanding	Price		Life	(in 000’s)
Outstanding options at January 1, 2015	2,892,717	$	26.65
Options granted	53,500	$	48.82
Options exercised	(148,952)	$	16.66		$	4,908
Options canceled/forfeited	(3,760)	$	30.09
Outstanding options at March 31, 2015	2,793,505	$	27.60	5.11	$	69,299
Exercisable options at March 31, 2015	1,141,065	$	20.84	3.90	$	36,022

Schedule of stock option assumptions for fair value estimate

	2016			2015
Weighted-average fair value of grants	$	11.32		$	8.97
Risk-free interest rates		1.38	%		1.19	%
Dividend yield		1.60	%		1.80	%
Expected volatility		23.11	%		22.98	%
Expected option life		5.31	years		5.43	years