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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e557-108580 + Details
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