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Stock-based Compensation
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Stock-based Compensation Stock-Based Compensation
 
The Company measures the cost of all share-based payments, including stock options, at fair value on the grant date and recognizes this cost in the results of operations, net of expected forfeitures. The fair values of stock options are estimated on the grant date using the Black-Scholes option-pricing model based on certain assumptions. The fair values of service and performance based stock awards are estimated based on the fair market value of the Company’s stock price on the grant date. The fair value of market based performance share awards are estimated on the grant date using the Monte Carlo valuation method.

Refer to Note 17 for a description of the Company’s stock-based compensation plans and their general terms. As of December 31, 2021, incentives have been awarded in the form of performance share awards and restricted stock unit awards (collectively, “Rights”) and stock options. The Company has elected to use the straight-line method to recognize compensation costs. Stock options and awards typically vest over a period ranging from six months to five years. The maximum term of stock option awards is 10 years. Upon exercise of a stock option or upon vesting of Rights, shares may be issued from treasury shares held by the Company or from authorized shares.
 
During 2021, 2020 and 2019, the Company recognized $11,470, $10,300, and $13,306, respectively, of stock-based compensation cost and $2,263, $2,198, and $2,805, respectively, of related tax benefits in the accompanying consolidated statements of income. Additionally, the Company recognized excess tax (expense) benefits in the tax provision of $(523), $(579) and $1,952 in 2021, 2020 and 2019, respectively. The Company has realized all available tax benefits related to deductions from excess stock awards exercised or Rights vested. At December 31, 2021, the Company had $17,910 of unrecognized compensation costs related to unvested awards which are expected to be recognized over a weighted average period of 1.73 years.

The following table summarizes information about the Company’s stock option awards during 2021:

Number of
Shares		Weighted-Average
Exercise
Price
Outstanding, January 1, 2021645,605 $49.29 
Granted154,314 52.73 
Exercised(33,305)32.53 
Forfeited— — 
Outstanding, December 31, 2021766,614 50.71 
 
The following table summarizes information about stock options outstanding at December 31, 2021:

 Options OutstandingOptions Exercisable
Range of
Exercise
Prices		Number
of Shares		Average
Remaining
Life (Years)		Average
Exercise
Price		Number
of Shares		Average
Exercise
Price
$24.24 to $36.31
176,200 3.61$33.11 176,200 $33.11 
$37.13 to $47.04
124,423 4.7845.52 120,808 45.77 
$51.55 to $59.28
263,823 7.8355.43 104,249 59.24 
$59.46 to $66.10
202,168 7.3363.09 106,989 62.43 
 
The Company received cash proceeds from the exercise of stock options of $1,083, $1,596 and $5,029 in 2021, 2020 and 2019, respectively. The total intrinsic value (the amount by which the stock price exceeds the exercise price of the option on the date of exercise) of the stock options exercised during 2021, 2020 and 2019 was $439, $781 and $5,324, respectively.
 
The weighted-average grant date fair value of stock options granted in 2021, 2020 and 2019 was $17.30, $14.69 and $14.04, respectively. The fair value of each stock option grant on the date of grant was estimated using the Black-Scholes option-pricing model based on the following weighted average assumptions:

202120202019
Risk-free interest rate0.55 %1.45 %2.43 %
Expected life (years)5.55.55.5
Expected volatility40.0 %26.0 %25.0 %
Expected dividend yield1.23 %1.25 %1.43 %
 
The risk-free interest rate is based on the term structure of interest rates at the time of the option grant. The expected life represents an estimate of the period of time that options are expected to remain outstanding. Assumptions of expected volatility of the Company’s common stock and expected dividend yield are estimates of future volatility and dividend yields based on historical trends.

The following table summarizes information about stock options outstanding that are expected to vest and stock options outstanding that are exercisable at December 31, 2021:

Options Outstanding, Expected to VestOptions Outstanding, Exercisable
SharesWeighted-
Average
Exercise
Price		Aggregate
Intrinsic
Value		Weighted-
Average
Remaining
Term (Years)		SharesWeighted-
Average
Exercise
Price		Aggregate
Intrinsic
Value		Weighted-
Average
Remaining
Term (Years)
754,648$50.71 $2,516 6.24508,246 $47.65 $2,522 5.04
 
The following table summarizes information about the Company’s Rights during 2021:

Service Based RightsService and Performance Based RightsService and Market Based Rights
Number of UnitsWeighted-Average Grant Date Fair ValueNumber of UnitsWeighted-Average Grant Date Fair ValueNumber of UnitsWeighted-Average Grant Date Fair Value
Outstanding, January 1, 2021227,425 $52.59 148,426 $61.71 74,213 $100.47 
Granted162,698 49.34 71,265 54.42 35,648 84.86 
Forfeited(14,258)56.53 (2,063)47.23 (1,030)94.55 
Additional Earned— — (36,048)59.28 (14,550)88.98 
Issued(116,758)47.23 (7,383)59.28 (7,166)88.98 
Outstanding, December 31, 2021259,107 174,197 87,115 

The Company granted 162,698 restricted stock unit awards and 106,913 performance share awards in 2021. All of the restricted stock unit awards vest upon meeting certain service conditions. "Additional Earned" reflects performance share awards earned above target that have been issued. The performance share awards are part of the long-term Performance Share Award Program (the "Awards Program"), which is designed to assess the long-term Company performance relative to the performance of companies included in the Russell 2000 Index or to pre-established goals. The performance goals are independent of each other and based on equally weighted metrics. For awards granted in 2021, 2020 and 2019, the metrics included the Company's total shareholder return ("TSR"), operating income before depreciation and amortization growth ("EBITDA growth") and return on invested capital ("ROIC"). The TSR and EBITDA growth metrics are designed to assess the long-term Company performance relative to the performance of companies included in the Russell 2000 Index over a three-year period. ROIC is designed to assess the Company’s performance compared to pre-established goals over a three-year performance period. The participants can earn from zero to 250% of the target award and the award includes a forfeitable right to dividend equivalents, which are not included in the aggregate target award numbers. Compensation expense for the awards is recognized over the three-year service period based upon the value determined under the intrinsic value method for EBITDA growth and ROIC portions of the award and the Monte Carlo simulation valuation model for the TSR portion of the award since it contains a market condition. The assumptions used to determine the weighted-average fair values of the market based portion of the 2021 awards include a 0.55% risk-free interest rate and a 50.2% expected volatility rate.
Compensation expense for the TSR portion of the awards is fixed at the date of grant and will not be adjusted in future periods based upon the achievement of the TSR performance goal. Compensation expense for the EBITDA growth and the ROIC portions of the awards is recorded each period based upon a probability assessment of achieving the goals with a final adjustment at the end of the service period based upon the actual achievement of those performance goals.