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Income Taxes - Tax Effects (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income (loss) before income taxes |  |  |
United States | $ 52,172 | $ 40,752 | $ 8,880
Foreign | 2,533 | 3,079 | 2,144
Income before income taxes | 54,705 | 43,831 | 11,024
Current: |  |  |
Federal | 41 | 430 |
State | 112 | 32 | 49
Foreign | 323 | 230 | (217)
Total current | 476 | 692 | (168)
Deferred: |  |  |
Federal | 8,108 | (82,048) |
State | 425 | (1,698) |
Foreign | (189) | (74) | 191
Total deferred | 8,344 | (83,820) | 191
Income tax provision (benefit) | 8,820 | (83,128) | 23
Reconciliation of income taxes at the United States Federal statutory rate to the effective income tax rate |  |  |
Income taxes at the United States statutory rate | 11,488 | 15,341 | 3,859
State income taxes | 299 | 203 | 32
Unrecognized tax benefits | (345) | (285) | (615)
Effect of change in valuation allowance | (441) | (115,831) | (7,765)
Foreign income tax rate differentials | 73 | (312) | 233
Unremitted earnings of foreign subsidiaries |  | (8,933) | 305
Stock options | (715) | (10,342) | 264
Credit expirations |  |  | 3,565
Repatriation of foreign earnings |  | 4,556 |
Recognition of equity NOL's |  | (1,165) |
Rate change | 160 | 42,531 |
Credit generation | (3,530) | (8,778) |
Discrete items, net | 972 | 31 |
Other, net | 859 | (144) | 145
Income tax provision (benefit) | 8,820 | (83,128) | $ 23
Significant components of long-term deferred income taxes |  |  |
Federal net operating loss carryforwards | 42,397 | 56,646 |
State net operating loss carryforwards | 1,387 | 1,586 |
Foreign net operating loss carryforwards | 641 | 758 |
Federal tax credit carryforwards | 16,200 | 14,312 |
State tax credit carryforwards | 6,489 | 6,908 |
Unremitted earnings of foreign subsidiaries |  | (21) |
Intangible assets | (29) | 116 |
Property, plant and equipment | 5,924 | 5,838 |
Accrued compensation | 97 | 45 |
Inventories | 3,713 | 3,798 |
Stock compensation | 2,760 | 2,351 |
Warranty | 1,090 | 980 |
Deferred revenue | 1,004 | 187 |
Other | (2,899) | (3,220) |
Deferred taxes, gross | 78,774 | 90,284 |
Valuation allowance | (6,835) | (7,136) |
Deferred taxes, net | $ 71,939 | $ 83,148 |

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