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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Statement of Comprehensive Income [Abstract]        
Net income before noncontrolling interest $ 53,608 $ 33,198 $ 75,857 $ 49,518
Other comprehensive income (loss):        
Change in net unrealized (loss) gain on debt securities (2,079) 25,089 (5,492) 31,260
Gain realized in net income 0 (231) 0 (209)
Total (2,079) 24,858 (5,492) 31,051
Unrealized (loss) gain on currency translation (680) 116 (564) (245)
Deferred income tax effect (518) 6,051 (1,371) 7,484
Total other comprehensive (loss) income (2,241) 18,923 (4,685) 23,322
Total comprehensive income 51,367 52,121 71,172 72,840
Total comprehensive income attributable to noncontrolling interest 1,304 1,078 2,485 2,000
Comprehensive income attributable to parent $ 50,063 $ 51,043 $ 68,687 $ 70,840