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Earnings per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Aug. 17, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Aug. 20, 2018
Earnings Per Common Share [Line Items] |  |  |  |  |
Conversion price (in dollars per share) |  | $ 101.38 | $ 101.38 | $ 101.38 |
Numerator — basic and diluted |  |  |  |  |
Net income |  | $ 274,892 | $ 235,514 | $ 234,966 |
Net income |  | $ 274,892 | $ 235,514 | $ 234,966 |
Denominator |  |  |  |  |
Weighted average number of common shares outstanding — basic (in shares) |  | 33,924,000 | 33,693,000 | 33,489,000 |
Effect of dilutive share-based awards (in shares) |  | 559,000 | 599,000 | 701,000 |
Effect of dilutive stock options (in shares) |  | 295,000 | 325,000 | 368,000 |
Effect of dilutive convertible notes (in shares) |  | 868,000 | 1,166,000 | 779,000 |
Weighted average number of common shares outstanding — diluted (in shares) |  | 35,646,000 | 35,783,000 | 35,337,000 |
Earnings per common share — basic (in dollars per share) |  | $ 8.10 | $ 6.99 | $ 7.02 |
Earnings per common share — diluted (in dollars per share) |  | $ 7.71 | $ 6.58 | $ 6.65 |
Stock Options And Share-Based Awards |  |  |  |  |
Denominator |  |  |  |  |
Antidilutive stock options and share-based awards (in shares) |  | 5,000 | 9,000 | 4,000 |
2023 Convertible Notes | Senior Notes |  |  |  |  |
Earnings Per Common Share [Line Items] |  |  |  |  |
Conversion price (in dollars per share) |  |  |  |  | $ 101.38
Common stock, shares issued (in shares) | 1,460,740 |  |  |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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