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Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2020
Income Tax Disclosure [Abstract]  
Pre-tax earnings by significant geographical locations Pre-tax earnings by significant geographical locations are as follows (in thousands):
Note 15.    Income Taxes - (Continued)
 Year Ended December 31,
 202020192018
United States$77,477 $81,695 $165,719 
Foreign207,527 160,221 141,384 
$285,004 $241,916 $307,103 
Provisions for income taxes
The provisions for income taxes are as follows (in thousands):
 Year Ended December 31,
 202020192018
Current tax expense (benefit):
Federal$10,281 $5,791 $17,900 
State2,877 5,895 5,980 
Foreign48,754 9,061 (16,008)
61,912 20,747 7,872 
Deferred tax expense (benefit):
Federal6,209 11,459 1,273 
State(1,488)(719)235 
Foreign5,787 38,832 15,298 
10,508 49,572 16,806 
Total income tax provision$72,420 $70,319 $24,678 
Deferred tax assets (liabilities)
Net deferred tax assets (liabilities) were classified on the balance sheet as follows (in thousands):
 December 31,
 20202019
Deferred tax assets, non-current$36,210 $39,983 
Deferred tax liabilities, non-current(43,708)(53,544)
       Net deferred tax liabilities$(7,498)$(13,561)
The tax effects of temporary differences that gave rise to significant portions of deferred tax assets and deferred tax liabilities were as follows (in thousands):
 December 31,
 20202019
Deferred tax assets:
Accrued liabilities and allowances$19,799 $17,850 
Tax credit and loss carry-forwards23,419 19,471 
Stock-based compensation6,476 10,660 
Inventory basis differences13,851 11,306 
Deferred revenue3,230 2,869 
Other assets— 265 
        Gross deferred tax assets66,775 62,421 
        Valuation allowance (4,399)(2,787)
Total deferred tax assets, net62,376 59,634 
Deferred tax liabilities:
Intangible assets(33,739)(38,209)
Property and equipment(17,249)(16,536)
Unremitted earnings of foreign subsidiaries(13,419)(13,225)
Other liabilities(5,467)(5,225)
Total deferred tax liabilities(69,874)(73,195)
Net deferred tax liabilities$(7,498)$(13,561)
Note 15.    Income Taxes - (Continued)
Effective income tax rate reconciliation
 Year Ended December 31,
 202020192018
Statutory federal tax rate21.0 %21.0 %21.0 %
Increase (decrease) in rates resulting from:
State taxes1.8 2.6 2.5 
Difference between statutory rate and foreign effective rate2.1 2.7 (0.2)
Foreign, federal and state income tax credits(2.8)(3.3)(1.5)
Non-deductible expenses5.9 3.1 2.3 
European Union state aid matter— — (10.8)
Domestic benefit of foreign sales(1.7)(2.1)(0.8)
United States transition tax— — (2.6)
Tax rate change on deferred items— 1.0 — 
Unremitted earnings of foreign subsidiaries— 2.3 (0.8)
Audit settlements— 6.7 — 
Other(0.9)(4.9)(1.1)
Effective tax rate25.4 %29.1 %8.0 %
Activity related to unrecognized tax benefits, including amounts accrued for potential interest and penalties
The following table summarizes the activity related to unrecognized tax benefits, including amounts accrued for potential interest and penalties (in thousands):
 Year Ended December 31,
 202020192018
Balance, beginning of year$20,753 $33,205 $77,275 
Increases related to current year tax positions14,874 2,602 — 
Increases related to prior year tax positions2,485 2,719 2,229 
Lapse of statute of limitations(10,616)(13,371)(1,558)
Settlements(1,764)(4,402)(40,514)
Change due to currency translation— — (4,227)
Balance, end of year$25,732 $20,753 $33,205 
Tax years open to examination by major taxing jurisdictions The Company currently has the following tax years open to examination by major taxing jurisdictions:
 Tax Years:
United States Federal2017-2019
State of California2015-2019
State of Massachusetts2016-2019
State of Oregon2017-2019
Sweden2012-2019
United Kingdom2016-2019
Belgium2012-2019