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EQUITY (Tables)

12 Months Ended

Dec. 31, 2017

EQUITY

Schedule of shares repurchased

				Aggregate
		Shares		Cost			Average
Year ended December 31,		Repurchased		(in thousands)			Repurchase Price
2017		201,932		$	10,636		$	52.67
2016		32,407			2,195			64.72
2015		—			—			—

Schedule of repurchases of shares from employees to satisfy tax withholding and stock exercise obligations

				Aggregate
		Shares		Cost			Average
Year ended December 31,		Repurchased		(in thousands)			Repurchase Price
2017		32,814		$	2,348		$	71.54
2016		38,279			2,775			72.50
2015		37,567			2,705			72.01

Summary of stock option activity

		Year Ended December 31, 2017
							Weighted Average
				Weighted Avg.			Remaining
		Number of		Exercise			Contractual		Aggregate
		Options		Price			Term (Years)		Intrinsic Value
Outstanding at January 1, 2017		225,822		$	39.77
Granted		10,000			52.97
Exercised		(35,801)			32.29
Outstanding at December 31, 2017		200,021			41.76		3.6		$	2,780,253
Vested and expected to vest at December 31, 2017		200,021			41.76		3.6		$	2,780,253
Exercisable at December 31, 2017		187,521			40.77		3.6		$	2,757,353

		Year Ended December 31, 2016
							Weighted Average
							Remaining
		Number of		Weighted Avg.			Contractual		Aggregate
		Options		Exercise Price			Term (Years)		Intrinsic Value
Outstanding at January 1, 2016		268,875		$	38.64
Granted		—			—
Exercised		(43,053)			32.70
Outstanding at December 31, 2016		225,822			39.77		3.9		$	9,114,963
Vested and expected to vest at December 31, 2016		225,554			39.73		3.9		$	9,112,630
Exercisable at December 31, 2016		222,072			39.23		3.8		$	9,082,338

Summary of information relating to options granted and exercised

The following table summarizes information relating to options granted and exercised during the years ended December 31, 2017, 2016 and 2015 (in thousands, except fair value of options granted data):

		2017			2016			2015
Weighted-average fair value of options granted		$	13.77		$	—		$	30.70
Aggregate intrinsic value of options exercised			936			1,591			3,488
Cash proceeds received upon exercise of options			1,030			649			1,998
Excess tax benefits from share-based compensation			—			591			1,423

Schedule of weighted-average assumptions using Black-Scholes option-pricing model for estimating fair value of each option granted

		2017		2016		2015
Risk-free interest rate		1.79	%	—		1.55	%
Expected dividend yield		1.28	%	—		1.76	%
Expected life		4.00	years	—		6.25	years
Expected volatility		34.01	%	—		51.85	%

Summary of restricted stock activity

The following table summarizes restricted stock activity during the year ended December 31, 2017:

				Weighted Avg.
		Shares		Fair Value
Unvested as of January 1, 2017		229,040		$	67.13
Granted		95,095			68.09
Forfeited		(12,074)			69.71
Vested and issued		(97,123)			64.01
Unvested as of December 31, 2017		214,938		$	68.62

The following table summarizes restricted stock activity during the year ended December 31, 2016:

				Weighted Avg.
		Shares		Fair Value
Unvested as of January 1, 2016		218,401		$	60.60
Granted		100,005			73.34
Forfeited		(1,125)			66.44
Vested and issued		(88,241)			58.01
Unvested as of December 31, 2016		229,040		$	67.13

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