SHARE-BASED COMPENSATION AND BENEFIT PLANS (Tables)

12 Months Ended

Dec. 31, 2018

Summary of Stock Option Activity

The following is a summary of stock option activity under the 2014 Plan and the 2001 Plan as of and for the year ended December 31, 2018:

	Options			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value
Options outstanding at December 31, 2017		398,833		$	136.44
Granted		188,550			173.48
Exercised		(54,934	)		114.09
Forfeited		(26,832	)		155.83
Expired		(1,000	)		122.62
Options outstanding at December 31, 2018		504,617		$	151.71		3.31	$	1,733
Options exercisable at December 31, 2018		71,487		$	135.89		2.13	$	826

Summary of Non-Vested Restricted Stock Activity

The following is a summary of non-vested restricted stock activity as of and for the year ended December 31, 2018:

	Shares			Weighted- Average Grant Date Fair Value
Non-vested restricted stock outstanding at December 31, 2017		2,985,239		$	51.22
Granted		142,865			167.06
Vested		(55,502	)		66.52
Forfeited		(10,000	)		142.52
Non-vested restricted stock outstanding at December 31, 2018		3,062,602		$	48.72

Valuation Assumptions Used for Stock Option Awards

The following table presents the weighted-average assumptions used for stock options granted:

Years Ended December 31,	2018			2017			2016
Expected term in years		4.25			4.25			4.25
Risk-free interest rate		2.69	%		1.77	%		1.24	%
Expected volatility		17.11	%		17.41	%		18.65	%
Expected dividend yield		3.13	%		2.82	%		2.54	%
Grant date fair value	$	20.05		$	17.23		$	16.37

Share-Based Compensation Expense

The following table provides information on share-based compensation expense:

Years Ended December 31,	2018		2017		2016
Stock options	$	2,014	$	1,451	$	1,149
Non-vested restricted stock		13,494		11,842		11,170
Share-based compensation expense	$	15,508	$	13,293	$	12,319