SHARE-BASED COMPENSATION AND BENEFIT PLANS (Tables)

12 Months Ended

Dec. 31, 2017

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, 2017:

	Options			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value
Options outstanding at December 31, 2016		294,250		$	122.80
Granted		179,750			150.35
Exercised		(39,751	)		98.05
Forfeited		(34,166	)		139.40
Expired		(1,250	)		67.25
Options outstanding at December 31, 2017		398,833		$	136.44		3.47	$	13,401
Options exercisable at December 31, 2017		33,919		$	121.65		2.80	$	1,641

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, 2017:

	Shares			Weighted- Average Grant Date Fair Value
Non-vested restricted stock outstanding at December 31, 2016		2,898,890		$	54.13
Granted		176,899			149.47
Vested		(80,550	)		50.05
Forfeited		(10,000	)		134.71
Non-vested restricted stock outstanding at December 31, 2017		2,985,239		$	51.22

Valuation Assumptions Used for Stock Option Awards

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

Years Ended December 31,	2017			2016			2015
Expected term in years		4.25			4.25			4.25
Risk-free interest rate		1.77	%		1.24	%		1.25	%
Expected volatility		17.41	%		18.65	%		20.96	%
Expected dividend yield		2.82	%		2.54	%		2.29	%
Grant date fair value	$	17.23		$	16.37		$	17.17

Share-Based Compensation Expense

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

Years Ended December 31,	2017		2016		2015
Stock options	$	1,451	$	1,149	$	952
Non-vested restricted stock		11,842		11,170		11,644
Share-based compensation expense	$	13,293	$	12,319	$	12,596