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Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Federal: |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | $ 40,314 | $ 87,804 | $ 57,173
Deferred |  |  |  |  |  |  |  |  | 8,952 | (10,142) | 21,961
Federal |  |  |  |  |  |  |  |  | 49,266 | 77,662 | 79,134
State: |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | 4,243 | 4,991 | 3,600
Deferred |  |  |  |  |  |  |  |  | (116) | 31 | 1,351
State |  |  |  |  |  |  |  |  | 4,127 | 5,022 | 4,951
Total |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | 44,557 | 92,795 | 60,773
Deferred |  |  |  |  |  |  |  |  | 8,836 | (10,111) | 23,312
Income tax expense (benefit) | $ 15,826 | $ 13,100 | $ 15,502 | $ 8,965 | $ 20,865 | $ 21,239 | $ 20,721 | $ 19,859 | $ 53,393 | $ 82,684 | $ 84,085

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