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Income Taxes - Income tax provision (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current: |  |  |  |
Federal |  | $ 21,156 | $ 26,015 | $ 25,515
State |  | 4,477 | 4,869 | 4,538
Total current |  | 25,633 | 30,884 | 30,053
Deferred: |  |  |  |
Charge in federal tax rate due to the 2017 Act |  | 11,375 |  |
Federal |  | (3,193) | (7,748) | (3,634)
State |  | (1,781) | (646) | (311)
Total deferred |  | 6,401 | (8,394) | (3,945)
Total provision for income taxes |  | $ 32,034 | $ 22,490 | $ 26,108
Statutory federal rate |  | 35.00% | 35.00% | 35.00%
Forecast |  |  |  |
Deferred: |  |  |  |
Statutory federal rate | 21.00% |  |  |

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