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Income Taxes - Components of Income Taxes (Benefit) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Federal: |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | $ 57,173 | $ 79,841 | $ 70,797
Deferred |  |  |  |  |  |  |  |  | 21,961 | 3,244 | 10,591
Federal |  |  |  |  |  |  |  |  | 79,134 | 83,085 | 81,388
State: |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | 3,600 | 6,636 | 4,987
Deferred |  |  |  |  |  |  |  |  | 1,351 | (518) | 1,189
State |  |  |  |  |  |  |  |  | 4,951 | 6,118 | 6,176
Total |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | 60,773 | 86,477 | 75,784
Deferred |  |  |  |  |  |  |  |  | 23,312 | 2,726 | 11,780
Income taxes | $ 21,115 | $ 22,154 | $ 21,499 | $ 19,317 | $ 23,647 | $ 21,727 | $ 22,458 | $ 21,371 | $ 84,085 | $ 89,203 | $ 87,564

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