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STOCK BASED COMPENSATION (Tables)
3 Months Ended
Jun. 30, 2020
STOCK BASED COMPENSATION  
Schedule of stock option activity

The following tables summarize option activity for the six-month periods ended June 30, 2020 and 2019:

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Weighted

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Weighted

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Average

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Aggregate

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Number of

​

Average

​

Remaining

​

Intrinsic

​

​

Options

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Exercise

​

Contractual

​

Value

​

    

Outstanding

    

Price

    

Life

    

(in 000’s)

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​

​

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Outstanding options at January 1, 2020

​

1,667,290

​

$

62.52

​

​

​

​

​

Options granted

​

30,375

​

​

94.62

​

​

​

​

​

Options exercised

​

(72,180)

​

​

45.92

​

​

​

$

3,181

Options canceled/forfeited

​

(2,370)

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​

66.57

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​

​

​

​

Outstanding options at June 30, 2020

​

1,623,115

​

$

63.86

​

4.82

​

$

30,819

Exercisable options at June 30, 2020

​

878,335

​

$

57.70

​

3.89

​

$

21,544

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​

Weighted

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​

​

​

​

Weighted

​

Average

​

Aggregate

​

​

Number of

​

Average

​

Remaining

​

Intrinsic

​

​

Options

​

Exercise

​

Contractual

​

Value

​

    

Outstanding

    

Price

    

Life

    

(in 000’s)

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​

​

​

​

​

​

​

​

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Outstanding options at January 1, 2019

​

1,964,880

​

$

54.24

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​

​

​

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Options granted

​

292,150

​

​

80.36

​

​

​

​

​

Options exercised

​

(414,470)

​

​

44.70

​

​

​

$

14,941

Options canceled/forfeited

​

(33,600)

​

​

57.61

​

​

​

​

​

Outstanding options at June 30, 2019

​

1,808,960

​

$

60.59

​

5.57

​

$

45,448

Exercisable options at June 30, 2019

​

672,110

​

$

52.17

​

4.21

​

$

22,544

Schedule of stock option assumptions for fair value estimate

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2020

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2019

 

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​

​

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Weighted-average fair value of grants

​

$

14.48

​

​

$

13.33

​

Risk-free interest rates

​

​

1.54

%

​

​

2.42

%

Dividend yield

​

​

2.69

%

​

​

2.69

%

Expected volatility

​

​

22.68

%

​

​

22.71

%

Expected option life

​

​

4.99

years

​

​

4.96

years