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Income Taxes - Tax Attributes and Valuation Allowances (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Operating Loss Carryforwards |  |  |
Balance at beginning of period, Valuation allowance | $ (1,462) | $ (1,177) | $ (607)
Additions to valuation allowance | (141) | (455) | (742)
Reductions to valuation allowance | 162 | 170 | 172
Balance at end of period, Valuation allowance | (1,441) | (1,462) | $ (1,177)
Deferred tax assets net | 216,492 | 245,822 |
ECOTEC |  |  |
Operating Loss Carryforwards |  |  |
Balance at end of period, Valuation allowance | (900) |  |
United States |  |  |
Operating Loss Carryforwards |  |  |
Operating loss carryforwards | 648,600 |  |
Tax credit carryforward | 1,700 |  |
Interest expense limitation carryforwards | 113,700 |  |
State |  |  |
Operating Loss Carryforwards |  |  |
Operating loss carryforwards | 271,700 |  |
Operating loss carryforwards not subject to expiration | 174,300 |  |
NOL valuation allowance | 600 | $ 500 |
Interest expense limitation carryforwards | $ 36,500 |  |

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