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Guarantor and Non-Guarantor Financial Information - Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) |  |
Net income (loss) | $ 500,106 | $ (35,063)
Other comprehensive income (loss), net of income taxes: |  |
Unrealized (appreciation) depreciation on securities, net | (601) | 12,412
Minimum pension liability adjustments, net | 340 | 366
Other comprehensive income (loss) | (261) | 12,778
Comprehensive income (loss) | 499,845 | (22,285)
Reportable Legal Entities | Guarantor/Parent |  |
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) |  |
Net income (loss) | 500,106 | (35,063)
Other comprehensive income (loss), net of income taxes: |  |
Minimum pension liability adjustments, net | 102 | 106
Other comprehensive income (loss) | 102 | 106
Comprehensive income (loss) | 500,208 | (34,957)
Reportable Legal Entities | Issuer Subsidiary |  |
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) |  |
Net income (loss) | 509,258 | (32,865)
Other comprehensive income (loss), net of income taxes: |  |
Unrealized (appreciation) depreciation on securities, net | (601) | 12,412
Minimum pension liability adjustments, net | 238 | 260
Other comprehensive income (loss) | (363) | 12,672
Comprehensive income (loss) | 508,895 | (20,193)
Reportable Legal Entities | Non-Guarantor Subsidiaries |  |
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) |  |
Net income (loss) | 19,527 | 202
Other comprehensive income (loss), net of income taxes: |  |
Comprehensive income (loss) | 19,527 | 202
Eliminations |  |
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) |  |
Net income (loss) | (528,785) | 32,663
Other comprehensive income (loss), net of income taxes: |  |
Comprehensive income (loss) | $ (528,785) | $ 32,663

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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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