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Guarantor and Non-Guarantor Financial Information - Statement of Operations (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 OPERATIONS |  |  |  |
Operating revenue | $ 577,484 | $ 405,283 | $ 1,141,571 | $ 773,873
Operating costs and other | 578,737 | 470,955 | 1,139,304 | 888,709
Operating income (loss) from continuing operations | (1,253) | (65,672) | 2,267 | (114,836)
Other income (expense), net | 1,726 | 1,512 | 3,980 | 2,889
Interest expense | (6,028) | (6,084) | (11,801) | (11,139)
Loss from continuing operations before income taxes | (5,555) | (70,244) | (5,554) | (123,086)
Income tax expense (benefit) | (3,922) | (21,771) | (504,563) | (40,059)
Income (loss) from continuing operations | (1,633) | (48,473) | 499,009 | (83,027)
Income (loss) from discontinued operations before income taxes | 1,263 | (94) | 744 | (518)
Income tax provision | 11,509 | 251 | 11,526 | 336
Loss from discontinued operations | (10,246) | (345) | (10,782) | (854)
Net income (loss) | (11,879) | (48,818) | 488,227 | (83,881)
Eliminations |  |  |  |
CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS |  |  |  |
Operating revenue | (21) | (16) | (37) | (33)
Operating costs and other | (246) | (230) | (451) | (461)
Operating income (loss) from continuing operations | 225 | 214 | 414 | 428
Other income (expense), net | (225) | (214) | (414) | (428)
Equity in net income (loss) of subsidiaries | 24,044 | 57,795 | (504,741) | 90,458
Loss from continuing operations before income taxes | 24,044 | 57,795 | (504,741) | 90,458
Income (loss) from continuing operations | 24,044 | 57,795 | (504,741) | 90,458
Net income (loss) | 24,044 | 57,795 | (504,741) | 90,458
Guarantor/Parent | Reportable Legal Entities |  |  |  |
CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS |  |  |  |
Operating costs and other | 4,209 | 3,300 | 8,387 | 6,760
Operating income (loss) from continuing operations | (4,209) | (3,300) | (8,387) | (6,760)
Other income (expense), net | 19 | 1 | 280 | 1
Interest expense | (138) | (87) | (166) | (173)
Equity in net income (loss) of subsidiaries | (7,963) | (46,677) | 499,457 | (79,669)
Loss from continuing operations before income taxes | (12,291) | (50,063) | 491,184 | (86,601)
Income tax expense (benefit) | (411) | (1,245) | 2,958 | (2,720)
Income (loss) from continuing operations | (11,880) | (48,818) | 488,226 | (83,881)
Net income (loss) | (11,880) | (48,818) | 488,226 | (83,881)
Issuer Subsidiary | Reportable Legal Entities |  |  |  |
CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS |  |  |  |
Operating revenue | 515,712 | 367,202 | 1,010,718 | 664,650
Operating costs and other | 503,173 | 415,544 | 984,821 | 755,046
Operating income (loss) from continuing operations | 12,539 | (48,342) | 25,897 | (90,396)
Other income (expense), net | 1,732 | 1,814 | 3,373 | 2,833
Interest expense | (4,551) | (5,148) | (10,251) | (9,857)
Equity in net income (loss) of subsidiaries | (16,081) | (11,118) | 5,284 | (10,789)
Loss from continuing operations before income taxes | (6,361) | (62,794) | 24,303 | (108,209)
Income tax expense (benefit) | 1,639 | (17,410) | (476,955) | (29,960)
Income (loss) from continuing operations | (8,000) | (45,384) | 501,258 | (78,249)
Net income (loss) | (8,000) | (45,384) | 501,258 | (78,249)
Non-Guarantor Subsidiaries | Reportable Legal Entities |  |  |  |
CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS |  |  |  |
Operating revenue | 61,793 | 38,097 | 130,890 | 109,256
Operating costs and other | 71,601 | 52,341 | 146,547 | 127,364
Operating income (loss) from continuing operations | (9,808) | (14,244) | (15,657) | (18,108)
Other income (expense), net | 200 | (89) | 741 | 483
Interest expense | (1,339) | (849) | (1,384) | (1,109)
Loss from continuing operations before income taxes | (10,947) | (15,182) | (16,300) | (18,734)
Income tax expense (benefit) | (5,150) | (3,116) | (30,566) | (7,379)
Income (loss) from continuing operations | (5,797) | (12,066) | 14,266 | (11,355)
Income (loss) from discontinued operations before income taxes | 1,263 | (94) | 744 | (518)
Income tax provision | 11,509 | 251 | 11,526 | 336
Loss from discontinued operations | (10,246) | (345) | (10,782) | (854)
Net income (loss) | $ (16,043) | $ (12,411) | $ 3,484 | $ (12,209)

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