STOCK BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2018

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, 2018	2,257,015	$	46.80
Options granted	367,500	$	63.27
Options exercised	(337,000)	$	31.60		$	11,151
Options canceled/forfeited	(5,200)	$	62.04
Outstanding options at June 30, 2018	2,282,315	$	51.66	5.34	$	33,224
Exercisable options at June 30, 2018	996,265	$	44.04	3.89	$	22,089
				Weighted
		Weighted		Average	Aggregate
	Number of	Average		Remaining	Intrinsic
	Options	Exercise		Contractual	Value
	Outstanding	Price		Life	(in 000’s)
Outstanding options at January 1, 2017	2,207,110	$	40.90
Options granted	407,875	$	56.88
Options exercised	(134,090)	$	25.23		$	4,328
Options canceled/forfeited	(40,600)	$	48.09
Outstanding options at June 30, 2017	2,440,295	$	44.32	5.03	$	29,968
Exercisable options at June 30, 2017	1,162,455	$	35.77	3.47	$	22,859

Schedule of stock option assumptions for fair value estimate

	2018			2017
Weighted-average fair value of grants	$	10.20		$	7.94
Risk-free interest rates		2.69	%		1.89	%
Dividend yield		3.15	%		3.60	%
Expected volatility		22.88	%		22.95	%
Expected option life		5.06	years		5.05	years