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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, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	$ (48,818)	$ 21,205	$ (83,881)	$ 37,207
Other comprehensive income (loss), net of income taxes:
Unrealized (appreciation) depreciation on securities, net	(10,507)	(1,453)	1,905	(12,463)
Minimum pension liability adjustments, net	366	313	732	626
Other comprehensive income (loss)	(10,141)	(1,140)	2,637	(11,837)
Comprehensive income (loss)	(58,959)	20,065	(81,244)	25,370
Reportable Legal Entities | Guarantor/Parent
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	(48,818)	21,205	(83,881)	37,207
Other comprehensive income (loss), net of income taxes:
Minimum pension liability adjustments, net	106	106	212	213
Other comprehensive income (loss)	106	106	212	213
Comprehensive income (loss)	(48,712)	21,311	(83,669)	37,420
Reportable Legal Entities | Issuer Subsidiary
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	(45,384)	22,736	(78,249)	40,036
Other comprehensive income (loss), net of income taxes:
Unrealized (appreciation) depreciation on securities, net	(10,507)	(1,453)	1,905	(12,463)
Minimum pension liability adjustments, net	260	207	520	413
Other comprehensive income (loss)	(10,247)	(1,246)	2,425	(12,050)
Comprehensive income (loss)	(55,631)	21,490	(75,824)	27,986
Reportable Legal Entities | Non-Guarantor Subsidiaries
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	(12,411)	(7,489)	(12,209)	(15,437)
Other comprehensive income (loss), net of income taxes:
Comprehensive income (loss)	(12,411)	(7,489)	(12,209)	(15,437)
Eliminations
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	57,795	(15,247)	90,458	(24,599)
Other comprehensive income (loss), net of income taxes:
Comprehensive income (loss)	$ 57,795	$ (15,247)	$ 90,458	$ (24,599)

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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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