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Income Taxes:
 6 Months Ended
Jun. 30, 2023
Income Tax Disclosure [Abstract]  
Income Tax Disclosure [Text Block] Income Taxes
 
Income taxes were accrued at an estimated effective tax rate of 57% and 46% for the three and six months ended June 30, 2023, respectively, as compared to 56% and 36% for the three and six months ended June 30, 2022, respectively.

    The effective tax rate for the three and six months ended June 30, 2023 differs from the federal statutory rate of 21% principally because of the effect of the mix of U.S. and foreign incomes, state income taxes, section 162(m) excess compensation, foreign-derived intangible income ("FDII") and tax credits and the following discrete items recognized during the interim period:

•Net unrecognized tax benefits resulting primarily from the expiration of statute of limitations during the three and six months ended June 30, 2023 of $6.0 million and $6.0 million, respectively.
•Excess tax benefit recognized on stock option exercises and the vesting of restricted stock units during the three and six months ended June 30, 2023 of $0.9 million and $0.2 million, respectively.
•The revaluation of the contingent consideration during the three and six months ended June 30, 2023 of $4.0 million and $3.3 million, respectively, resulted in a tax expense of $0.0 million for both periods.

    The effective tax rate for the three and six months ended June 30, 2022 differs from the federal statutory rate of 21% principally because of the effect of the mix of U.S. and foreign incomes, state income taxes, section 162(m) excess compensation, FDII and tax credits. The effective tax rate during the three and six months ended June 30, 2022 included a discrete tax benefit of $0.0 million and $2.6 million, respectively, related to excess tax benefits recognized on stock option exercises and the vesting of restricted stock units during the period and the revaluation of the contingent consideration during the three and six months ended June 30, 2022 resulted in a tax expense of $0.0 million for both periods.