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Income Taxes (Components of Provision (Benefit)) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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: |  |  |  |  |  |  |  |  |  |  |
Domestic federal |  |  |  |  |  |  |  |  | $ 54 | $ 530 | $ (320)
Foreign |  |  |  |  |  |  |  |  | 1,330 | 500 | 500
Foreign withholding taxes |  |  |  |  |  |  |  |  | 240 | 280 | 1,240
Domestic state |  |  |  |  |  |  |  |  | 120 | 110 | 0
Total current |  |  |  |  |  |  |  |  | 1,744 | 1,420 | 1,420
Deferred: |  |  |  |  |  |  |  |  |  |  |
Domestic federal |  |  |  |  |  |  |  |  | 0 | 1,680 | 720
Foreign |  |  |  |  |  |  |  |  | 0 | 0 | (210)
Domestic state |  |  |  |  |  |  |  |  | 0 | 0 | (20)
Total deferred |  |  |  |  |  |  |  |  | 0 | 1,680 | 490
Total provision | $ 474 | $ 986 | $ 194 | $ 90 | $ 1,060 | $ 70 | $ 1,670 | $ 300 | $ 1,744 | $ 3,100 | $ 1,910

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