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EQUITY (Tables)

12 Months Ended

Dec. 31, 2019

EQUITY

Schedule of shares repurchased

​

​	​	​	​	​	​	​	​	​	​
​	​	​	​	​		​	​	​	​
​	​	Shares	​	Aggregate Cost		​	Average		​
Year ended December 31,		Repurchased		(in thousands)			Repurchase Price
2019		3,104	​	$	162	​	$	52.37	​
2018		30,427	​	​	1,577	​	​	51.82	​
2017		201,932	​	​	10,636	​	​	52.67	​

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		​
2019		42,703	​	$	2,419	​	$	56.65	​
2018		141,180	​	​	10,859	​	​	76.76	​
2017		32,814	​	​	2,348	​	​	72.50	​

Summary of stock option activity

​

​	​	​	​	​	​	​	​	​	​	​	​
​	​	Year Ended December 31, 2019									​
​	​	​	​	​	​	​	Weighted Average	​	​	​	​
​	​	​	​	​	​	​	Remaining	​	​	​	​
​	​	Number of	​	Weighted Avg.		​	Contractual	​	Aggregate		​
​		Options		Exercise Price			Term (Years)		Intrinsic Value
Outstanding at January 1, 2019		42,000	​	$	48.61	​	​	​	​	​	​
Granted	​	—	​	​	—	​	​	​	​	​	​
Forfeited		(7,500)	​		52.97	​	​	​	​	​	​
Expired		(2,500)	​		52.97	​	​	​	​	​	​
Exercised		(17,000)	​		45.39	​	​	​	​	​	​
Outstanding at December 31, 2019		15,000	​	​	49.34	​	3.2	​	$	170,900	​
Vested and expected to vest at December 31, 2019		15,000	​	​	49.34	​	3.2	​	$	170,900	​
Exercisable at December 31, 2019		15,000	​	​	49.34	​	3.2	​	$	170,900	​

​

​	​	​	​	​	​	​	​	​	​	​	​
​	​	Year Ended December 31, 2018									​
​	​	​	​	​	​	​	Weighted Average	​	​	​	​
​	​	​	​	​	​	​	Remaining	​	​	​	​
​	​	Number of	​	Weighted Avg.		​	Contractual	​	Aggregate		​
​		Options		Exercise Price			Term (Years)		Intrinsic Value
Outstanding at January 1, 2018		200,021	​	$	41.76	​	​	​	​	​	​
Granted		—	​		—	​	​	​	​	​	​
Exercised		(158,021)	​		39.95	​	​	​	​	​	​
Outstanding at December 31, 2018		42,000	​		48.61		4.1		$	823,515	​
Vested and expected to vest at December 31, 2018		42,000	​		48.61		4.1		$	962,840	​
Exercisable at December 31, 2018		33,250	​		46.76		3.0		$	823,515	​

​

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, 2019, 2018 and 2017 (in thousands, except fair value of options granted data):

​	​	​	​	​	​	​	​	​	​	​
​		2019			2018			2017
Weighted-average fair value of options granted	​	$	—	​	$	—	​	$	13.77	​
Aggregate intrinsic value of options exercised	​		229	​		5,927	​	​	936	​
Cash proceeds received upon exercise of options	​		—	​		72	​	​	1,030	​
Excess tax benefits from share-based compensation	​		—	​		—	​	​	—	​

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

​

​	​	​
​	2017	​
​	​	​
Risk-free interest rate	1.79	%
Expected dividend yield	1.28	%
Expected life	4.00	years
Expected volatility	34.01	%

Summary of restricted stock activity

The following table summarizes restricted stock activity during the year ended December 31, 2019:

​	​	​	​	​	​	​
​		​	​	Weighted Avg.		​
​		Shares		Fair Value
Unvested as of January 1, 2019		200,653	​	$	65.21	​
Granted		108,278	​	​	54.68	​
Forfeited		(18,579)	​	​	57.04	​
Vested and issued		(86,206)	​	​	65.77	​
Unvested as of December 31, 2019		204,146	​	$	60.13	​

​

The following table summarizes restricted stock activity during the year ended December 31, 2018:

​	​	​	​	​	​	​
​		​	​	Weighted Avg.		​
​		Shares		Fair Value
Unvested as of January 1, 2018		214,938	​	$	68.62	​
Granted		111,474	​		59.52	​
Forfeited		(31,327)	​		66.53	​
Vested and issued		(94,432)	​		66.27	​
Unvested as of December 31, 2018		200,653	​	$	65.21	​

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