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Related Party Transactions (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Related Party Transaction [Line Items] |  |  |  |
Selling, general and administrative expenses | $ 146,707 | $ 139,901 | $ 433,848 | $ 417,896
Related Party |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Selling, general and administrative expenses | $ 300 | $ 400 | $ 800 | $ 1,100
Distribution Solutions Group | LKCM Headwater Operations, LLC | Significant Shareholder |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Shares owned by related party (in shares) | 36,357,588 |  | 36,357,588 |
Noncontrolling ownership (as a percent) | 78.50% |  | 78.50% |

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