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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income before noncontrolling interest	$ 33,198	$ 31,436	$ 49,518	$ 36,106
Other comprehensive (loss) income:
Change in net unrealized gain (loss) on debt securities	25,089	(35,993)	31,260	(43,472)
(Gain) loss realized in net income	(231)	166	(209)	1,176
Total	24,858	(35,827)	31,051	(42,296)
Unrealized gain (loss) on currency translation	116	0	(245)	0
Deferred income tax effect	6,051	(8,879)	7,484	(11,964)
Total other comprehensive (loss) income	18,923	(26,948)	23,322	(30,332)
Total comprehensive income	52,121	4,488	72,840	5,774
Total comprehensive income attributable to noncontrolling interest	1,078	0	2,000	0
Comprehensive income attributable to parent	$ 51,043	$ 4,488	$ 70,840	$ 5,774

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