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Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (154,683)	$ (8,008)	$ (74,833)	$ 480,219
Other comprehensive income, net of income taxes:
Unrealized appreciation on securities, net of income taxes of ($5.6) million and ($2.0) million for the three and nine months ended June 30, 2018, respectively	0	13,826	0	5,657
Minimum pension liability adjustments, net of income taxes of ($0.1) million and ($0.2) million for the three and nine months ended June 30, 2019, respectively, and ($0.1) million and ($0.4) million for the three and nine months ended June 30, 2018, respectively	226	337	675	985
Other comprehensive income	226	14,163	675	6,642
Comprehensive income (loss)	$ (154,457)	$ 6,155	$ (74,158)	$ 486,861

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