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Share-Based Compensation Level 3 (Tables)
 12 Months Ended
Dec. 31, 2023
Share-Based Payment Arrangement, Noncash Expense [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] The fair values of our stock options are calculated using the following weighted average assumptions, based on the methods described above:
Years Ended December 31,
Assumptions202320222021
Dividend yield1.6%1.5%1.8%
Expected volatility25.4%23.9%23.5%
Risk-free interest rate4.0%1.8%0.4%
Expected holding period (years)4.54.04.0
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
The following table summarizes certain information with respect to stock option and restricted share compensation included in our Consolidated Statement of Operations:
Years Ended December 31,
 202320222021
 (In thousands)
Total pretax employee share-based compensation expense included in net income$15,423 $14,709 $14,168 
Income tax benefit related to share-based compensation included in net income$3,822 $3,877 $3,537 
Share-based Payment Arrangement, Option, Activity [Table Text Block]
The following table sets forth stock option activity for the year ended December 31, 2023 (shares reported in whole numbers):
OptionsWeighted-Average
Exercise Price
Outstanding at December 31, 2022
5,461,105 $40.47 
Granted371,700 $70.34 
Exercised(926,610)$26.10 
Outstanding at December 31, 2023
4,906,195 $45.44 
Exercisable at December 31, 2023
3,989,812 $41.68 
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable [Table Text Block]
Set forth below is certain information related to stock options outstanding and exercisable at December 31, 2023 (shares reported in whole numbers):
 Options OutstandingOptions Exercisable
Range of Exercise Price
Number
Outstanding at
December 31, 2023
Weighted-Average Remaining Contractual Life
(in years)		Weighted-
Average Exercise Price
Number
Exercisable at
December 31, 2023
Weighted-
Average Exercise Price
$0.00 — 25.0055,320 0.1$22.28 55,320 $22.28 
$25.01 — 35.00894,450 1.1$29.25 894,450 $29.25 
$35.01 — 45.001,519,695 2.6$39.65 1,519,695 $39.65 
$45.01 — 55.001,506,810 4.6$50.31 1,308,944 $50.42 
$55.01 — 65.00558,220 6.1$59.76 211,403 $59.76 
$65.01 — 75.00371,700 7.1$70.34 — $— 
$0.00 — 75.004,906,195 3.6$45.44 3,989,812 $41.68 
Other Information Pertaining to Stock Option Activity [Table Text Block]
Other information pertaining to stock options was as follows (in thousands, except weighted-average grant date fair value):
Years Ended December 31,
202320222021
Weighted average grant-date fair value of stock options granted$16.86 $11.02 $7.50 
Total fair value of stock options vested$6,059 $5,538 $5,708 
Total intrinsic value of stock options exercised$37,115 $42,700 $59,180 
Cash received from the exercise of stock options
$24,181 $27,814 $39,354 
Recognized compensation expense
$5,929 $5,738 $5,514 
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
Restricted share award activity was as follows (share awards reported in whole numbers):
Restricted
Share Awards		Weighted-Average
Grant-Date
Fair Value
Nonvested restricted share awards at December 31, 2022
212,115 $54.66 
Granted89,484 $70.34 
Vested(114,826)$53.38 
Nonvested restricted share awards at December 31, 2023
186,773 $62.95 
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
Restricted
Share Units		Weighted-Average
Grant-Date
Fair Value
Nonvested restricted share units at December 31, 2022
118,936 $54.31 
Granted52,162 $70.34 
Vested(61,390)$52.47 
Nonvested restricted share units at December 31, 2023
109,708 $62.96