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Income Taxes - Components of Federal and State Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Current expense |  |  |  |  |  |
Federal taxes |  |  |  | $ 2,875 | $ 1,552 | $ 44,779
State taxes |  |  |  | 6,434 | (630) | 10,936
Total current provision |  |  |  | 9,309 | 922 | 55,715
Deferred expense (benefit) |  |  |  |  |  |
Federal taxes |  |  |  | 6,708 | (52,886) | (47,056)
State taxes |  |  |  | (500) | (1,169) | (5,819)
Total deferred provision |  |  |  | 6,208 | (54,055) | (52,875)
Income tax expense (benefit) | $ 3,531 | $ 1,828 | $ 5,359 | $ 15,517 | $ (53,133) | $ 2,840
Effective tax rate |  |  |  | 25.00% | (400.80%) | 146.00%

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