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Share Based Award (Tables) | 12 Months Ended
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Dec. 31, 2023
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,
|  | 2023 |  | 2022 |  | 2021
Stock compensation expense |  | $ | 40,563 |  |  | $ | 36,025 |  |  | $ | 27,341 |
Tax benefit from stock-based compensation cost |  | $ | 5,379 |  |  | $ | 4,636 |  |  | $ | 6,391 |
Indirect tax benefit |  | $ | — |  |  | $ | 749 |  |  | $ | 285 |
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 and shares in thousands, except per option amounts):
|  |  |  | Year ended December 31,
|  |  |  | 2022 |  | 2021
Number of time-based options granted |  |  |  | 7,620 |  |  | 7,910 |
Grant-date fair value of options granted |  |  |  | $ | 540 |  |  | $ | 528 |
Weighted-average assumptions for stock option valuation: |  |  |  |  |  |
Expected term (years) |  |  |  | 5.5 |  | 5.5
Expected stock price volatility |  |  |  | 36.0 | % |  | 35.0 | %
Risk-free interest rate |  |  |  | 3.0 | % |  | 0.9 | %
Expected dividend yield |  |  |  | — | % |  | — | %
Weighted-average grant-price per option |  |  |  | $ | 185.79 |  |  | $ | 200.07 |
Weighted-average grant-date fair value per option |  |  |  | $ | 70.86 |  |  | $ | 66.78 |
There were no stock options granted during the year ended December 31, 2023.
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, 2023 is as follows:
|  | Shares |  | Weighted-Average Exercise Price Per Share |  | Weighted-Average Contractual Life (Years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2022 |  | 527,461 |  |  | $ | 79.94 |  |  |  |  |
Granted |  | — |  |  | $ | — |  |  |  |  |
Exercised |  | (67,633) |  |  | $ | 59.47 |  |  |  |  |
Forfeited or expired |  | — |  |  | $ | — |  |  |  |  |
Outstanding at December 31, 2023 |  | 459,828 |  |  | $ | 82.95 |  |  | 1.1 |  | $ | 11,856 |
Exercisable at December 31, 2023 |  | 459,828 |  |  | $ | 82.95 |  |  | 1.1 |  | $ | 11,856 |
Vested and expected to vest, December 31, 2023 |  | 459,828 |  |  | $ | 82.95 |  |  | 1.1 |  | $ | 11,856 |
Exercised Options Data [Table Text Block] | The following table presents information regarding stock option activity (in thousands):
|  | Year ended December 31,
|  | 2023 |  | 2022 |  | 2021
Intrinsic value of options exercised |  | $ | 8,441 |  |  | $ | 17,340 |  |  | $ | 27,534 |
Cash received from exercise of stock options |  | $ | 4,022 |  |  | $ | 8,785 |  |  | $ | 9,372 |
Tax benefit from stock option exercises |  | $ | 1,733 |  |  | $ | 3,637 |  |  | $ | 5,092 |
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,
|  | 2023 |  | 2022 |  | 2021
PRSU |  |  |  |  |  |
Shares granted |  | 78,213 |  |  | 60,383 |  |  | 53,246 |
Shares earned (1) |  | 49,314 |  |  | 46,317 |  |  | 32,013 |
Grant-date fair value per share |  | $ | 190.02 |  |  | $ | 230.31 |  |  | $ | 198.16 |
Grant-date fair value |  | $ | 14,862 |  |  | $ | 13,907 |  |  | $ | 10,551 |
Intrinsic value vested |  | $ | 8,024 |  |  | $ | 10,487 |  |  | $ | 6,777 |
RSU |  |  |  |  |  |
Shares granted |  | 156,111 |  |  | 116,870 |  |  | 84,388 |
Grant-date fair value per share |  | $ | 173.10 |  |  | $ | 221.65 |  |  | $ | 199.13 |
Grant-date fair value |  | $ | 27,024 |  |  | $ | 25,905 |  |  | $ | 16,804 |
Intrinsic value vested |  | $ | 14,179 |  |  | $ | 16,438 |  |  | $ | 13,681 |
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, 2023:
|  | Number of Units |  | Grant-Date Fair Value Per Share |  | Weighted-Average Contractual Life (Years) |  | Aggregate Intrinsic Value (in thousands)
Non-vested at December 31, 2022 |  | 354,004 |  |  | $ | 213.95 |  |  |  |  |
Change in units due to performance expectations (1) |  | 5,554 |  |  | $ | 188.11 |  |  |  |  |
Granted |  | 234,324 |  |  | $ | 178.75 |  |  |  |  |
Vested |  | (140,091) |  |  | $ | 200.66 |  |  |  |  |
Forfeited |  | (5,190) |  |  | $ | 188.98 |  |  |  |  |
Non-vested and expected to vest at December 31, 2023 |  | 448,601 |  |  | $ | 199.68 |  |  | 0.9 |  | $ | 44,743 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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