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Guarantor and Non-Guarantor Financial Information - Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	$ (11,879)	$ (48,818)	$ 488,227	$ (83,881)
Other comprehensive income (loss), net of income taxes:
Unrealized appreciation (depreciation) on securities, net	(7,568)	(10,507)	(8,169)	1,905
Minimum pension liability adjustments, net	308	366	648	732
Other comprehensive income (loss)	(7,260)	(10,141)	(7,521)	2,637
Comprehensive income (loss)	(19,139)	(58,959)	480,706	(81,244)
Reportable Legal Entities | Guarantor/Parent
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	(11,880)	(48,818)	488,226	(83,881)
Other comprehensive income (loss), net of income taxes:
Minimum pension liability adjustments, net	92	106	194	212
Other comprehensive income (loss)	92	106	194	212
Comprehensive income (loss)	(11,788)	(48,712)	488,420	(83,669)
Reportable Legal Entities | Issuer Subsidiary
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	(8,000)	(45,384)	501,258	(78,249)
Other comprehensive income (loss), net of income taxes:
Unrealized appreciation (depreciation) on securities, net	(7,568)	(10,507)	(8,169)	1,905
Minimum pension liability adjustments, net	216	260	454	520
Other comprehensive income (loss)	(7,352)	(10,247)	(7,715)	2,425
Comprehensive income (loss)	(15,352)	(55,631)	493,543	(75,824)
Reportable Legal Entities | Non-Guarantor Subsidiaries
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	(16,043)	(12,411)	3,484	(12,209)
Other comprehensive income (loss), net of income taxes:
Comprehensive income (loss)	(16,043)	(12,411)	3,484	(12,209)
Eliminations
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	24,044	57,795	(504,741)	90,458
Other comprehensive income (loss), net of income taxes:
Comprehensive income (loss)	$ 24,044	$ 57,795	$ (504,741)	$ 90,458

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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