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Income Taxes (Tables)
9 Months Ended
Sep. 30, 2021
Income Tax Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit)
The following table presents components of income tax expense for the three and nine months ended September 30, 2021 and 2020:
Three months ended September 30,Nine months ended
September 30,
(in thousands, except percentages)
2021202020212020
Income tax based on income from continuing operations (1)$13,150 $12,666 $37,733 $36,237 
Provision for change in estimated tax rate397 (1,196)179 (1,687)
Income tax before discrete items13,547 11,470 37,912 34,550 
Discrete tax expense:
Exercise of U.S. stock options(4)(7)(160)(7)
Adjustments to prior period tax liabilities(674)(1,750)(2,095)(983)
Revaluation of deferred tax assets due to tax rate change — 352 — 
Provision for/resolution of tax audits and contingencies, net (46)278 (1,779)
Write-off of net operating losses related to tax audit —  1,830 
Tax effect of non-deductible foreign exchange loss on intercompany loan  3,658 
Creation of valuation allowance  230 
Other20 88 
Total income tax expense$12,889 $9,686 $36,375 $37,504 
(1) Calculated at estimated tax rates of 30.0% and 32.2%, respectively