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Income Taxes, Provision for Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Current income tax expense (benefit) [Abstract] |  |  |  |
Federal | $ 9,660 | $ 12,994 | $ (9,071) | [1]
State | 3,000 | 2,622 | 205 |
Foreign | 24,418 | 22,680 | 23,187 |
Current income tax expense, total | 37,078 | 38,296 | 14,321 |
Deferred expense (benefit) [Abstract] |  |  |  |
Federal | (6,918) | (17,246) | 3,977 |
State | (565) | 18 | 3,164 |
Foreign | (1,222) | (2,112) | 2,703 |
Deferred income tax expense (benefit), total | (8,705) | (19,340) | 9,844 |
Income taxes | $ 28,373 | $ 18,956 | 24,165 |
Transition tax for accumulated foreign earnings, Income tax benefit |  |  | $ 3,900 |
[1] | In 2018, this amount includes $3.9 million of income tax benefit related to a reduction in the 2017 estimate of the one-time transition tax on earnings of foreign subsidiaries enacted by the 2017 Tax Legislation (see discussion below).

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