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Income Taxes (Schedule of Components of Income Tax Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Tax Disclosure [Abstract]            
Income tax based on income from continuing operations $ 13,150   $ 12,666   $ 37,733 $ 36,237
Provision for change in estimated tax rate 397   (1,196)   179 (1,687)
Income tax before discrete items 13,547   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) $ (1,400) (1,750)   (2,095) (983)
Revaluation of deferred tax assets due to tax rate change 0   0   352 0
Provision for/resolution of tax audits and contingencies, net 0 $ 300 (46) $ (1,500) 278 (1,779)
Write-off of net operating losses related to tax audit 0   0   0 1,830
Tax effect of non-deductible foreign exchange loss on intercompany loan 0   3   0 3,658
Creation of valuation allowance 0   8   0 230
Other 20   8   88 5
Total income tax expense $ 12,889   $ 9,686   $ 36,375 $ 37,504
Effective income tax rate reconciliation, percent 30.00%   32.20%   30.00% 32.20%