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Share Based Award (Tables)
 12 Months Ended
Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]  
Schedule of stock compensation and related tax benefits [Table Text Block] The table below summarizes compensation costs and related tax benefits (in thousands):
 Year ended December 31,
 (In thousands)202220212020
Stock compensation expense$36,025 $27,341 $23,954 
Tax benefit from stock-based compensation cost$4,636 $6,391 $5,564 
Indirect tax benefit$749 $285 $1,203 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] The table below summarizes the total time-based stock options granted, total valuation and the weighted-average assumptions (dollars in thousands, except per option amounts):
 Year ended December 31,
 202220212020
Number of time-based options granted7,620 7,910 7,190 
Grant-date fair value of options granted (in thousands)$540 $528 $425 
Weighted-average assumptions for stock option valuation:
Expected term (years)5.55.55.5
Expected stock price volatility36.0 %35.0 %35.0 %
Risk-free interest rate3.0 %0.9 %0.4 %
Expected dividend yield— %— %— %
Weighted-average grant-price per option$185.79 $200.07 $181.99 
Weighted-average grant-date fair value per option$70.86 $66.78 $59.09 
Share-based Payment Arrangement, Option, Activity [Table Text Block]
A summary of our stock option activity as of and for the year ended December 31, 2022 is as follows:
 SharesWeighted-Average Exercise Price Per ShareWeighted-Average Contractual Life (Years)Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2021663,098 $74.75 
Granted7,620 $185.79 
Exercised(142,772)$61.53 
Forfeited or expired(485)$60.01 
Outstanding at December 31, 2022527,461 $79.94 2.0$42,708 
Exercisable at December 31, 2022519,841 $78.39 2.0$42,708 
Vested and expected to vest, December 31, 2022527,461 $79.94 1.9$42,708 
Exercised Options Data [Table Text Block]
The following table presents information regarding stock option activity:
 Year ended December 31,
(In thousands)202220212020
Intrinsic value of options exercised$17,340 $27,534 $32,915 
Cash received from exercise of stock options$8,785 $9,372 $13,193 
Tax benefit from stock option exercises$3,637 $5,092 $5,179 
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] The table below summarizes our restricted stock award activity (dollars in thousands):
Year ended December 31,
(In thousands, except shares and per share amounts)202220212020
PRSU
Shares granted60,383 53,246 38,633 
Shares earned (a)
46,317 32,013 80,654 
Grant-date fair value per share$230.31 $198.16 $188.34 
Grant-date fair value$13,907 $10,551 $7,276 
Intrinsic value vested$10,487 $6,777 $15,627 
RSU
Shares granted116,870 84,388 87,830 
Grant-date fair value per share$221.65 $199.13 $188.13 
Grant-date fair value$25,905 $16,804 $16,523 
Intrinsic value vested$16,438 $13,681 $12,314 
Nonvested Restricted Stock Shares Activity [Table Text Block]
The table below provides a summary of our PRSU and RSU activity as of and for the year ended December 31, 2022:  
 Number of UnitsGrant-Date Fair Value Per ShareWeighted-Average Contractual Life (Years)Aggregate Intrinsic Value (in thousands)
Non-vested at December 31, 2021275,761 $201.05 
Change in units due to performance expectations (a)
32,346 $239.63 
Granted177,253 $224.60 
Vested(118,321)$206.40 
Forfeited(13,035)$218.24 
Non-vested and expected to vest at December 31, 2022354,004 $213.95 1.0$55,749