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Income Taxes: Reconciliation of unrecognized tax benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Liability for Uncertain Tax Positions, Noncurrent, Period Start $ 10,554 $ 8,383 $ 4,165
Additions for prior year tax positions 7 448 3,788
Reductions for prior year tax positions (773) (732) (1,313)
Additions for current year tax positions 2,097 2,455 1,743
Liability for Uncertain Tax Positions, Noncurrent, Period End 11,885 $ 10,554 $ 8,383
Unrecognized Tax Benefits that Would Impact Effective Tax Rate $ 5,700