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Income Taxes - Deferred tax valuation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Valuation Allowance, Deferred Tax Asset [Roll Forward]      
Balance, beginning of year $ 23,295 $ 14,114 $ 16,579
Other changes 6,349 9,181 (2,465)
Balance, end of year $ 29,644 $ 23,295 $ 14,114