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Employee compensation plans (Tables) | 12 Months Ended
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Dec. 31, 2024
Share-Based Payment Arrangement [Abstract] |
Share-Based Payment Arrangement, Restricted Stock Activity | The following table summarizes the status of the Company's non-vested restricted Class A Stock awards under the 2014 OIP for the year ended December 31, 2024:
| Number of Class A Shares Subject to Restricted Stock Awards |  | Weighted Average Fair Value Per Share |  | Weighted Average Remaining Contractual Life
Nonvested at beginning of year | 1,589,414 |  |  | $ | 32.92 |  |  | 1.6 years
Granted | 330,140 |  |  | 37.86 |  |  | 2.7 years
Vested | (463,175) |  |  | 28.44 |  |  | — |
Forfeited | (21,411) |  |  | 38.44 |  |  | — |
Nonvested at end of year | 1,434,968 |  |  | $ | 35.42 |  |  | 1.6 years
Share-Based Payment Arrangement, Stock Appreciation Right | The following table summarizes the status of the Company's outstanding OARs awards as of December 31, 2024:
Grant Date |  | Number of OARs Outstanding |  | Strike Price |  | Remaining Contractual Life |  | Fair Value as of December 31, 2024
January 10, 2020 |  | 478,680 |  |  | $ | 27.54 |  |  | 9 days |  | $ | 36.57 |
January 11, 2021 |  | 573,329 |  |  | 32.16 |  |  | 1 year |  | 32.57 |
January 7, 2022 |  | 605,087 |  |  | 49.57 |  |  | 2 years |  | 18.87 |
January 6, 2023 |  | 506,170 |  |  | 45.33 |  |  | 3 years |  | 25.00 |
January 5, 2024 |  | 479,470 |  |  | 40.78 |  |  | 4 years |  | 29.48 |
Total OARs outstanding |  | 2,642,736 |  |  |  |  |  |  |
Total weighted average values |  |  |  | $ | — |  |  | 3.0 years |  | $ | — |
Schedule of Share-Based Payment Award, Non-Options Equity Instrument, Valuation Assumptions | The fair value as of December 31, 2024 for each of the OARs was estimated using the Black-Scholes model with the following assumptions:
|  | Grant Date
|  | January 10, 2020 |  | January 11, 2021 |  | January 7, 2022 |  | January 6, 2023 |  | January 5, 2024
Expected term (1) |  | 9 days |  | 1 year |  | 2 years |  | 3 years |  | 4 years
Expected volatility factor (2) |  | 22.353 | % |  | 26.966 | % |  | 24.353 | % |  | 30.793 | % |  | 31.158 | %
Risk-free interest rate (3) |  | 4.314 | % |  | 4.183 | % |  | 4.228 | % |  | 4.261 | % |  | 4.319 | %
(1) The expected term was determined based on the remaining life of the actual awards. (2) The volatility factor was measured using the weighted average of historical daily price changes of the Company's Class A Stock over a historical period commensurate to the expected term of the awards. (3) The risk-free interest rate was based on periods equal to the expected term of the awards based on the U.S. Treasury yield curve in effect at December 31, 2024.

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- Definition Schedule Of Share-Based Payment Award, Non-Options Equity Instrument, Valuation Assumptions + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock appreciation rights awards that were outstanding at the beginning and end of the year, and the number of stock appreciation rights awards that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -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 Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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