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Stock Plans and Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of stock options and stock appreciation rights
The following table presents the activity related to stock options and SARs under all plans for the year ended December 31, 2019.  
 
Number of Shares/Rights
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Term
 
Aggregate Intrinsic Value
Outstanding at January 1, 2019
225,375

 
$
48.02

 
 
 
 
Granted
0

 
0.00

 
 
 
 
Exercised
(64,865
)
 
43.41

 
 
 
 
Forfeited
(2,888
)
 
58.91

 
 
 
 
Outstanding at December 31, 2019
157,622

 
$
49.72

 
4.34
 
$
6,585,638

Exercisable at December 31, 2019
103,927

 
$
46.91

 
3.83
 
$
4,634,146
Schedule of intrinsic value of options, SARs, and restricted stock Net cash proceeds, tax benefits and intrinsic value related to total stock options, SARs, and restricted stock exercised is as follows: 

(in thousands)
2019
 
2018
 
2017
Proceeds from stock option exercises
$
(992
)
 
$
(540
)
 
$
(641
)
Tax benefits related to stock option exercises
944

 
680

 
1,634

Intrinsic value of stock option exercises
2,460

 
1,447

 
3,139
Schedule of total stock options exercised Net cash proceeds, tax benefits and intrinsic value related to total stock options, SARs, and restricted stock exercised is as follows: 

(in thousands)
2019
 
2018
 
2017
Proceeds from stock option exercises
$
(992
)
 
$
(540
)
 
$
(641
)
Tax benefits related to stock option exercises
944

 
680

 
1,634

Intrinsic value of stock option exercises
2,460

 
1,447

 
3,139
Schedule of options outstanding
December 31, 2019
 
 
 
 
 
 
Options and SARs Outstanding
 
Options and SARs Exercisable
Range of Exercise Prices
 
Number Outstanding
 
Weighted Average Remaining Contractual Life
 
Weighted Average Exercise Price
 
Number Exercisable
 
Weighted Average Exercise Price
$35.71-37.50
 
31,680

 
1.62
 
$
37.00

 
31,680

 
$
37.00

$37.51-41.00
 
28,155

 
3.28
 
$
40.60

 
21,500

 
$
40.60

$41.01-50.00
 
47,195

 
4.86
 
$
49.22

 
28,226

 
$
49.22

$50.01-76.90
 
50,370

 
6.15
 
$
63.12

 
22,410

 
$
63.87

$76.91-86.18
 
222

 
6.89
 
$
86.18

 
111

 
$
86.18

 
 
157,622

 
4.34
 
$
49.72

 
103,927

 
$
46.91
Schedule of restricted stock awards
The following table presents activity related to restricted stock awards for the twelve months ended December 31, 2019. 
 
Number of Shares
 
Weighted Average Fair Value
Unvested at January 1, 2019
255,239

 
$
66.52

Granted
62,360

 
89.21

Vested
(61,275
)
 
60.48

Forfeited
(8,357
)
 
70.62

Unvested at December 31, 2019
247,967

 
$
73.66