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Share Based Compensation (Tables)
12 Months Ended
Dec. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]

 

 

 

2019

 

 

2018

 

 

2017

 

 

Stock options

$

1,448

 

$

1,053

 

$

958

 

 

Nonvested stock awards and restricted stock units

 

3,206

 

 

2,459

 

 

2,935

 

 

Employee stock purchase plan

 

84

 

 

89

 

 

88

 

 

Non-elective and elective 401(k) matching contribution in stock

 

 

 

 

 

72

 

 

Director stock ownership plan

 

123

 

 

123

 

 

137

 

 

Total share-based compensation expense

$

4,861

 

$

3,724

 

$

4,190

 

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

 

 

 

 

Weighted

 

Weighted

 

 

 

 

 

 

 

Average

 

Average

 

 

 

 

 

 

 

Exercise

 

Remaining

 

Aggregate

 

 

Number of

 

Price

 

Contractual

 

Intrinsic

 

 

Options

 

(per option)

 

Term (years)

 

Value

Options outstanding as of January 1, 2019

122,072

 

$

116.39

 

 

 

 

 

 

Options granted

51,610

 

 

154.92

 

 

 

 

 

 

Options exercised

(28,535)

 

 

80.22

 

 

 

 

 

 

Options forfeited

(735)

 

 

147.01

 

 

 

 

 

Options outstanding as of December 31, 2019

144,412

 

$

137.15

 

4.8

 

$

4,066

Options expected to vest after December 31, 2019

84,839

 

$

151.12

 

5.6

 

$

1,204

Options exercisable as of December 31, 2019

59,573

 

$

117.27

 

3.7

 

$

2,862

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

 

 

 

 

 

 

 

 

 

 

 

Weighted

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Average

 

Weighted

 

 

 

Weighted

 

 

 

 

 

 

 

 

 

 

Number

 

Remaining

 

Average

 

Number

 

Average

 

 

Range of

 

of Options

 

Contractual

 

Exercise Price

 

of Options

 

Exercise Price

 

 

Exercise Prices

 

Outstanding

 

Term (years)

 

(per option)

 

Exercisable

 

(per option)

 

 

$

50.01

 

-

 

$

60.00

 

874

 

0.2

 

$

58.26

 

874

 

$

58.26

 

 

$

60.01

 

-

 

$

70.00

 

 

 

 

 

 

 

 

 

$

70.01

 

-

 

$

80.00

 

17,268

 

2.7

 

 

72.29

 

17,268

 

 

72.29

 

 

$

80.01

 

-

 

$

90.00

 

2,797

 

2.1

 

 

87.30

 

2,797

 

 

87.30

 

 

$

90.01

 

-

 

$

130.00

 

 

 

 

 

 

 

 

 

$

130.01

 

-

 

$

140.00

 

37,167

 

4.0

 

 

134.60

 

24,898

 

 

134.60

 

 

$

140.01

 

-

 

$

150.00

 

 

 

 

 

 

 

 

 

$

150.01

 

-

 

$

160.00

 

86,306

 

5.7

 

 

153.65

 

13,736

 

 

152.26

 

 

 

 

 

 

 

 

 

 

144,412

 

4.8

 

 

137.15

 

59,573

 

 

117.27

 

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

 

 

2019

 

2018

 

2017

 

2016

 

 

Number of stock options granted

51,610

 

 

35,842

 

 

42,477

 

 

67,444

 

 

 

Dividend yield

1.12

%

 

1.37

%

 

1.49

%

 

1.49

%

 

 

Expected volatility

26.29

%

 

24.73

%

 

25.52

%

 

28.39

%

 

 

Risk-free interest rate

1.52

%

 

2.54

%

 

1.67

%

 

1.08

%

 

 

Expected term (years)

4.0

 

 

4.0

 

 

4.0

 

 

4.0

 

 

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

 

 

 

2019

 

 

2018

 

 

2017

 

 

2019 Stock option awards

$

665

 

$

 

$

 

 

2018 Stock option awards

 

364

 

 

310

 

 

 

 

2017 Stock option awards

 

369

 

 

367

 

 

308

 

 

2016 Stock option awards

 

50

 

 

332

 

 

332

 

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

 

 

Number of

 

Weighted Average Grant

 

 

 

Shares

 

Date Fair Value (per share)

 

 

Nonvested awards, December 31, 2018

52,785

 

$

112.09

 

 

Granted

40,382

 

 

158.16

 

 

Vested

(27,572)

 

 

84.19

 

 

Forfeited

(1,095)

 

 

123.27

 

 

Nonvested awards, December 31, 2019

64,500

 

$

152.67

 

Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]

 

 

Number of

 

Weighted Average Grant

 

 

 

Units

 

Date Fair Value (per unit)

 

 

Nonvested awards, December 31, 2018

4,650

 

$

117.03

 

 

Granted

6,060

 

 

154.92

 

 

Vested

(1,972)

 

 

78.36

 

 

Forfeited

(83)

 

 

145.96

 

 

Nonvested awards, December 31, 2019

8,655

 

$

152.09