Income Taxes - Reconciliation of Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Provision for income taxes attributable to continuing operations
Income tax expense at the federal statutory rate			$ 878	$ 13,623	$ 14,937
State taxes, net of federal benefit			184	1,265	(242)
Mexico inflation adjustment			(801)	(936)	(1,286)
Non-deductible items			2,088	2,214	1,114
Tax credits			(551)	(615)	(536)
Foreign rate differential			1,080	1,405	(151)
Change in valuation allowance			1,601	3,986	(2,030)
Stock compensation			(711)	0	(386)
Uncertain tax positions			(1,596)	(4,808)	202
Change in tax rate resulting from enactment of the Act			0	2,558	0
Other			234	(303)	(529)
Total income tax expense	$ (1,058)	$ 7,411	$ 2,406	$ 18,389	$ 11,093
Effective tax rate			58.00%	33.00%	26.00%

Effective Income Tax Rate Reconciliation, Foreign Inflation Adjustment, Amount

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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