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Related Party Transactions (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Related Party Transaction [Line Items] |  |  |  |
Selling, general and administrative expenses | $ 152,268 | $ 143,258 | $ 301,977 | $ 287,141
Related Party |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Selling, general and administrative expenses | $ 100 | $ 400 | $ 300 | $ 600
Distribution Solutions Group | LKCM Headwater Operations, LLC | Significant Shareholder |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Shares owned by related party (in shares) | 36,400,000 |  | 36,400,000 |
Noncontrolling ownership (as a percent) | 78.60% |  | 78.60% |

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