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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 USD ($) item $ / shares | Jun. 30, 2015 USD ($) $ / shares | Mar. 31, 2015 USD ($) item $ / shares | Dec. 31, 2014 USD ($) $ / shares | Sep. 30, 2014 USD ($) $ / shares | Jun. 30, 2014 USD ($) $ / shares | Mar. 31, 2014 USD ($) $ / shares | Dec. 31, 2013 USD ($) $ / shares | Sep. 30, 2015 USD ($) $ / shares | Sep. 30, 2014 USD ($) $ / shares | Sep. 30, 2013 USD ($) $ / shares
SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 566,110 | $ 659,694 | $ 883,052 | $ 1,056,585 | $ 985,038 | $ 952,087 | $ 893,430 | $ 889,152 | $ 3,165,441 | $ 3,719,707 | $ 3,387,614
Operating income | (16,021) | 132,780 | 227,172 | 331,819 | 263,502 | 271,912 | 255,342 | 264,031 | 675,750 | 1,054,787 | 956,661
Income from continuing operations | (21,208) | 90,887 | 149,536 | 203,057 | 168,705 | 192,290 | 174,589 | 173,182 | 422,272 | 708,766 | 721,453
Net income | $ (21,214) | $ 90,860 | $ 149,537 | $ 203,042 | $ 168,688 | $ 192,279 | $ 174,570 | $ 173,182 | $ 422,225 | $ 708,719 | $ 736,639
Basic earnings per common share: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations (in dollars per share) | $ / shares | $ (0.20) | $ 0.84 | $ 1.38 | $ 1.87 | $ 1.55 | $ 1.77 | $ 1.61 | $ 1.61 | $ 3.90 | $ 6.54 | $ 6.75
Net income (in dollars per share) | $ / shares | (0.20) | 0.84 | 1.38 | 1.87 | 1.55 | 1.77 | 1.61 | 1.61 | 3.90 | 6.54 | 6.89
Diluted earnings per common share: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations (in dollars per share) | $ / shares | (0.20) | 0.83 | 1.37 | 1.85 | 1.53 | 1.75 | 1.59 | 1.59 | 3.87 | 6.46 | 6.65
Net income (in dollars per share) | $ / shares | $ (0.20) | $ 0.83 | $ 1.37 | $ 1.85 | $ 1.53 | $ 1.75 | $ 1.59 | $ 1.59 | $ 3.87 | $ 6.46 | $ 6.79
Gain from the sale of assets, net | $ 1,700 | $ 1,300 | $ 1,900 | $ 2,500 | $ 5,000 | $ 1,400 | $ 2,700 | $ 3,700 |  |  |
Gain from the sale of assets, per diluted share (in dollars per share) | $ / shares | $ 0.02 | $ 0.01 | $ 0.02 | $ 0.02 | $ 0.05 | $ 0.01 | $ 0.02 | $ 0.03 |  |  |
After-tax impairment charge | $ 24,900 |  |  |  |  |  |  |  |  |  |
Impairment charge, per diluted share (in dollars per share) | $ / shares | $ 0.23 |  |  |  |  |  |  |  |  |  |
Number of FlexRigs decommissioned | item |  |  | 17 |  |  |  |  |  |  |  |
Number of land rigs and drilling equipment decommissioned | item | 6 |  |  |  |  |  |  |  |  |  |
After-tax abandonment charge | $ 19,100 |  | $ 7,500 |  |  |  |  |  |  |  |
Abandonment charge, per diluted share (in dollars per share) | $ / shares | $ 0.18 |  | $ 0.05 |  |  |  |  |  |  |  |
Gain on sale of investment securities, net of tax |  |  |  |  |  | $ 14,900 | $ 12,900 |  |  |  |
Gain from the sale of investment securities, per diluted share (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.13 | $ 0.12 |  |  |  |

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