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Segment Information - Income Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2016
Segment information |  |  |
Total assets | $ 6,677,637 |  | $ 6,832,019
Operating revenues | 368,590 | $ 487,847 |
United States |  |  |
Segment information |  |  |
Operating revenues | 300,559 | 409,506 |
Argentina |  |  |
Segment information |  |  |
Operating revenues | 48,082 | 49,786 |
Colombia |  |  |
Segment information |  |  |
Operating revenues | 9,371 | 6,743 |
Ecuador |  |  |
Segment information |  |  |
Operating revenues | 1 | 3,940 |
Other foreign |  |  |
Segment information |  |  |
Operating revenues | 10,577 | 17,872 |
Continued operations |  |  |
Segment information |  |  |
Total assets | 6,677,586 |  | 6,831,955
Discontinued operation |  |  |
Segment information |  |  |
Total assets | 51 |  | 64
Other |  |  |
Segment information |  |  |
Operating revenues | 3,111 | 3,968 |
Operating segment |  |  |
Segment information |  |  |
Total assets | 5,534,115 |  | 5,633,773
Operating revenues | 368,798 | 488,066 |
Operating segment | U.S. Land |  |  |
Segment information |  |  |
Total assets | 4,933,281 |  | 5,005,299
Operating segment | Offshore |  |  |
Segment information |  |  |
Total assets | 106,860 |  | 105,152
Operating segment | International Land |  |  |
Segment information |  |  |
Total assets | 457,566 |  | 487,181
Operating segment | Other |  |  |
Segment information |  |  |
Total assets | 36,408 |  | 36,141
Operating revenues | 3,319 | $ 4,187 |
Investments and corporate operations |  |  |
Segment information |  |  |
Total assets | $ 1,143,471 |  | $ 1,198,182

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