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GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION - Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ (22,532) | $ (21,799) | $ (48,818) | $ (35,063) | $ (72,835) | $ (21,200) | $ 21,205 | $ 16,002 | $ (128,212) | $ (56,828) | $ 420,427
Other comprehensive income (loss), net of income taxes: |  |  |  |  |  |  |  |  |  |  |
Unrealized (appreciation) depreciation on securities, net |  |  |  |  |  |  |  |  |  |  | (80,217)
Unrealized (appreciation) depreciation on securities, net |  |  |  |  |  |  |  |  | (829) | 2,772 | (80,217)
Reclassification of realized (gains) losses in net income, net |  |  |  |  |  |  |  |  |  | 926 |
Minimum pension liability adjustments, net |  |  |  |  |  |  |  |  | 3,333 | (2,525) | (4,286)
Other comprehensive income (loss) |  |  |  |  |  |  |  |  | 2,504 | 1,173 | (84,503)
Comprehensive income (loss) |  |  |  |  |  |  |  |  | (125,708) | (55,655) | 335,924
Reportable Legal Entities | Guarantor/Parent |  |  |  |  |  |  |  |  |  |  |
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | (128,212) | (56,828) | 420,427
Other comprehensive income (loss), net of income taxes: |  |  |  |  |  |  |  |  |  |  |
Minimum pension liability adjustments, net |  |  |  |  |  |  |  |  | 860 | (63) | (666)
Other comprehensive income (loss) |  |  |  |  |  |  |  |  | 860 | (63) | (666)
Comprehensive income (loss) |  |  |  |  |  |  |  |  | (127,352) | (56,891) | 419,761
Reportable Legal Entities | Issuer Subsidiary |  |  |  |  |  |  |  |  |  |  |
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | (113,892) | (46,856) | 425,302
Other comprehensive income (loss), net of income taxes: |  |  |  |  |  |  |  |  |  |  |
Unrealized (appreciation) depreciation on securities, net |  |  |  |  |  |  |  |  |  |  | (80,217)
Unrealized (appreciation) depreciation on securities, net |  |  |  |  |  |  |  |  | (829) | 2,772 |
Reclassification of realized (gains) losses in net income, net |  |  |  |  |  |  |  |  |  | 926 |
Minimum pension liability adjustments, net |  |  |  |  |  |  |  |  | 2,473 | (2,462) | (3,620)
Other comprehensive income (loss) |  |  |  |  |  |  |  |  | 1,644 | 1,236 | (83,837)
Comprehensive income (loss) |  |  |  |  |  |  |  |  | (112,248) | (45,620) | 341,465
Reportable Legal Entities | Non-Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | (10,332) | (14,782) | (11,088)
Other comprehensive income (loss), net of income taxes: |  |  |  |  |  |  |  |  |  |  |
Comprehensive income (loss) |  |  |  |  |  |  |  |  | (10,332) | (14,782) | (11,088)
Eliminations |  |  |  |  |  |  |  |  |  |  |
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 124,224 | 61,638 | (414,214)
Other comprehensive income (loss), net of income taxes: |  |  |  |  |  |  |  |  |  |  |
Comprehensive income (loss) |  |  |  |  |  |  |  |  | $ 124,224 | $ 61,638 | $ (414,214)

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