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Income Taxes - Tax Effects (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income (loss) before income taxes |  |  |
United States | $ 198,028 | $ 116,380 | $ 51,934
Foreign | 6,857 | 4,048 | 3,952
Income before income taxes | 204,885 | 120,428 | 55,886
Current: |  |  |
Federal | 8,430 |  |
State | 1,716 | 82 | 157
Foreign | 3,124 | 1,439 | 1,062
Total current | 13,270 | 1,521 | 1,219
Deferred: |  |  |
Federal | 9,097 | 20,521 | 4,594
State | (102) | 406 | 295
Foreign | (459) | (670) | (204)
Total deferred | 8,536 | 20,257 | 4,685
Income tax provision | $ 21,806 | 21,778 | 5,904
Reconciliation of income taxes at the United States Federal statutory rate to the effective income tax rate |  |  |
Effective Federal income tax rate | 10.60% |  |
Income taxes at the United States statutory rate | $ 43,026 | 25,290 | 11,736
State income taxes | 1,075 | 387 | 226
Effect of change in valuation allowance | 680 | (1,443) | 806
Foreign income tax rate differentials | 289 | 152 | 181
Stock based compensation | (3,818) | (3,658) | (2,803)
Internal revenue code section 162m limitation | 2,692 | 1,481 | 409
Credit expirations | 1,181 | 2,342 | (14)
Rate change | 94 | 159 | 151
Credit generation | (4,764) | (3,096) | (2,473)
Discrete items, net | 206 | 72 | (147)
Previously unrecognized tax benefit |  |  | (4,063)
GILTI inclusion | 69 | 301 | 732
Other, net | 1,602 | (209) | 1,163
Foreign-derived intangible income | (20,526) |  |
Income tax provision | 21,806 | 21,778 | $ 5,904
Deferred tax assets: |  |  |
Federal net operating loss carryforwards |  | 5,635 |
State net operating loss carryforwards | 291 | 727 |
Foreign net operating loss carryforwards | 276 | 371 |
Federal tax credit carryforwards |  | 18,840 |
State tax credit carryforwards | 8,683 | 8,138 |
Property, plant and equipment | 8,755 | 8,967 |
Operating lease liability | 1,564 | 792 |
Accrued compensation | 276 | 280 |
Inventories | 1,613 | 1,729 |
Stock compensation | 1,620 | 1,401 |
Warranty | 1,993 | 1,471 |
Deferred revenue | 4,501 | 836 |
Capitalized research and development costs | 18,067 |  |
Gross deferred tax assets | 47,639 | 49,187 |
Valuation allowance | (8,370) | (7,689) |
Net deferred tax assets | 39,269 | 41,498 |
Deferred tax liabilities: |  |  |
Intangible assets | (176) | (72) |
Right-of-use asset | (5,400) | (4,918) |
Other | (1,992) | (1,054) |
Gross deferred tax liabilities | (7,568) | (6,044) |
Deferred taxes, net | 31,701 | $ 35,454 |
Decrease in valuation allowance | $ 700 |  |

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