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Income Taxes - (Narratives) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Income Tax Disclosure [Abstract]          
Income tax benefit $ 2,605 $ 1,397 $ 7,280 $ 3,653 $ 1,777
Effective rate of income tax (percentage) 11.20%   14.00% 15.60% 12.40%
Decrease in deferred tax assets $ (1,300)        
Operating loss carryforward, foreign 46,200        
Deferred tax asset valuation allowances $ 11,342   $ 10,040 $ 4,987