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Income Taxes - Schedule of Provision for Income Tax (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Current: |  |  |  |  |  |  |  |  |  |  |
Federal income tax |  |  |  |  |  |  |  |  | $ 102 | $ 244 | $ (1,348)
State income tax |  |  |  |  |  |  |  |  | 0 | 0 | (98)
Total current |  |  |  |  |  |  |  |  | 102 | 244 | (1,446)
Deferred: |  |  |  |  |  |  |  |  |  |  |
Federal income tax |  |  |  |  |  |  |  |  | (3,286) | 4,538 | 10,432
State income tax |  |  |  |  |  |  |  |  | (662) | 739 | 1,919
Total deferred |  |  |  |  |  |  |  |  | (3,948) | 5,277 | 12,351
Total provision (benefit) for income taxes | $ (10,559) | $ 3,665 | $ 4,321 | $ (1,273) | $ (1,898) | $ 3,392 | $ 6,102 | $ (2,075) | $ (3,846) | $ 5,521 | $ 10,905

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