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Share-Based Compensation and Capital Stock (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Weighted Average Assumptions of Black-Scholes Option-Pricing Model The fair value of the options granted was estimated on the grant date using the Black-Scholes option-pricing model with the following weighted average assumptions: 
202120202019
Risk-free interest rate0.94 %0.99 %2.46 %
Expected volatility29.23 %20.88 %21.49 %
Expected life of stock option5.9 years5.9 years4.4 years
Dividend yield0.82 %0.99 %1.06 %
Requisite service period4 years4 years4 years
Contractual life10 years10 years7 years
Weighted average fair value of options granted (per option)$28.00 $17.25 $15.84 
Schedule of Options Outstanding and Exercisable The following table summarizes information about stock options outstanding as of December 31, 2021:
 Options OutstandingOptions Exercisable
Range of Exercise PricesNumber Outstanding at December 31, 2021Weighted Average
Remaining
Contractual Life (Years)		Weighted
Average
Exercise Price		Number Exercisable at December 31, 2021Weighted
Average
Exercise Price
$45.59 to $55.00
156,462 1.16$51.49 156,462 $51.49 
$55.01 to $65.00
84,038 2.1060.86 84,038 60.86 
$65.01 to $85.00
239,981 3.7581.31 142,673 81.35 
$85.01 to $91.28
153,692 8.1791.28 38,419 91.28 
$91.29 to $104.87
276,771 9.16104.87 — — 
910,944 5.54$83.14 421,592 $67.09 
Schedule of Activity Related to Restricted Stock Grants
The following table is a summary of activity related to restricted stock grants:
For the Year Ended December 31,
202120202019
Restricted shares granted61,009 158,133 167,731 
Weighted average grant date fair value per share$111.25 $90.18 $81.92 
Aggregate grant date fair value (in thousands)$6,787 $14,260 $13,741 
Restricted shares forfeited19,209 36,860 32,735 
Vesting service period of shares granted
9 - 48 months
12 - 48 months
12 - 48 months
Fair value of shares vested (in thousands)$11,927 $9,000 $10,671 
Schedule of Activity Related to PVRSU Grants
The following table is a summary of activity related to PVRSU grants:
For the Years Ended December 31,
202120202019
PVRSUs granted at target98,544 170,471 83,934 
Weighted average grant date fair value per share$108.75 $134.26 $81.15 
Aggregate grant date fair value (in thousands)$10,716 $22,888 $6,811 
PVRSUs forfeited & expired78,500 33,080 18,379 
Requisite service period
9 - 60 months
31 to 36 months
36 to 48 months
Schedule of Change in Stock-Based Award Activity
A summary of stock-based award activity as of December 31, 2021, 2020 and 2019 and the changes during those years are presented below:
2021
Stock OptionsRestricted StockPerformance Vested
Restricted Stock Units
OptionsWeighted Average Exercise PriceWeighted
Average
Remaining Contractual
Life 		SharesWeighted
Average Grant
Date Fair Value		SharesWeighted
Average Grant
Date Fair Value
Outstanding as of January 1, 2021819,610 $70.48 304,439 $84.48 321,752 $109.25 
Granted280,811 104.87 61,009 111.25 98,544 108.75 
Performance-based leveraging*— — — — 74,832 107.51 
Exercised/vested(185,437)59.61 (109,640)80.83 (3,986)81.55 
Expired— — — — (72,944)81.55 
Forfeited(4,040)104.87 (19,209)90.23 (5,556)55.76 
Outstanding as of December 31, 2021910,944 $83.14 5.5 years236,599 $92.60 412,642 $114.70 
Options exercisable as of December 31, 2021421,592 $67.09 2.8 years
* PVRSU units outstanding have been increased by 74,832 units during the year ended December 31, 2021, due to the Company exceeding the targeted performance conditions contained in PVRSU's granted in prior periods.
2020
Stock OptionsRestricted StockPerformance Vested
Restricted Stock Units
OptionsWeighted Average Exercise PriceWeighted
Average
Remaining Contractual
Life		SharesWeighted
Average Grant
Date Fair Value		SharesWeighted
Average Grant
Date Fair Value
Outstanding as of January 1, 2020873,895 $61.69 312,097 $75.23 330,716 $70.03 
Granted158,620 91.28 158,133 90.18 170,471 134.26 
Performance-based leveraging*— — — — 30,116 60.68 
Exercised/vested(209,209)49.17 (128,931)69.80 (176,471)58.68 
Expired— — — — (16,117)60.50 
Forfeited(3,696)91.28 (36,860)81.98 (16,963)82.25 
Outstanding as of December 31, 2020819,610 $70.48 4.2 years304,439 $84.48 321,752 $109.25 
Options exercisable as of December 31, 2020480,255 $60.70 2.5 years
* PVRSU units outstanding have been increased by 30,116 units during the year ended December 31, 2020, due to the Company exceeding the targeted performance conditions contained in PVRSU's granted in prior periods.
2019
Stock OptionsRestricted StockPerformance Vested
Restricted Stock Units
OptionsWeighted Average Exercise PriceWeighted
Average
Remaining Contractual
Life		SharesWeighted
Average Grant
Date Fair Value		SharesWeighted
Average Grant
Date Fair Value
Outstanding as of January 1, 20191,186,180 $54.13 303,765 $65.06 336,820 $63.28 
Granted141,827 81.15 167,731 81.92 83,934 81.15 
Performance-based leveraging*— — — — 1,583 51.49 
Exercised/vested(446,456)47.96 (126,664)60.39 (73,242)50.69 
Expired— — — — — — 
Forfeited(7,656)51.49 (32,735)72.54 (18,379)72.50 
Outstanding as of December 31, 2019873,895 $61.69 3.5 years312,097 $75.23 330,716 $70.03 
Options exercisable as of December 31, 2019513,924 $55.10 2.6 years
* PVRSU units outstanding have been increased by 1,583 units during the year ended December 31, 2019, due to the Company exceeding the targeted performance conditions contained in PVRSU's granted in prior periods.
Pre-Tax Stock-Based Compensation Expenses and Associated Income Tax Benefits
The components of the Company’s pretax stock-based compensation expense and associated income tax benefits are as follows:
For the Year Ended December 31,
(in thousands)202120202019
Stock options$3,396 $1,975 $2,194 
Restricted stock9,281 8,731 8,043 
Performance vested restricted stock units10,703 (3,466)6,409 
Total share-based compensation expense$23,380 $7,241 $16,646 
Income tax benefit$5,648 $1,706 $4,010 
Schedule of Unrecognized Compensation Cost, Nonvested Awards The total unrecognized compensation costs related to stock-based awards that have not yet vested and the related weighted average amortization period over which the costs are to be recognized as of December 31, 2021 are as follows:
(in thousands)Unrecognized Compensation Expense on Unvested AwardsWeighted Average Remaining Amortization Period
Stock options$8,050 2.8 years
Restricted stock13,976 2.1 years
Performance vested restricted stock units25,973 1.4 years
Total$47,999