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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Operating revenues        
Contract drilling services $ 630,290 $ 717,653 $ 1,241,688 $ 1,455,011
Other 3,349 3,215 6,608 6,455
Total operating revenues 633,639 720,868 1,248,296 1,461,466
Operating costs and expenses        
Contract drilling services operating expenses, excluding depreciation and amortization 417,743 441,719 817,072 929,312
Other operating expenses 1,315 1,620 2,737 2,894
Depreciation and amortization 132,006 143,161 262,137 284,620
Research and development 6,214 7,262 13,092 14,281
Selling, general and administrative 41,978 43,506 91,786 98,014
Asset impairment charge 563,234 0 563,234 0
Gain on sale of assets (10,310) (11,546) (14,589) (17,090)
Total operating costs and expenses 1,152,180 625,722 1,735,469 1,312,031
Operating income from continuing operations (518,541) 95,146 (487,173) 149,435
Other income (expense)        
Interest and dividend income 3,566 2,061 5,780 4,512
Interest expense (6,095) (6,167) (12,195) (10,888)
Gain (loss) on investment securities (12,413) 5,878 (9,592) (36,957)
Gain on sale of subsidiary 0 0 14,963 0
Other (398) 17 (797) 548
Total other income (expense) (15,340) 1,789 (1,841) (42,785)
Income (loss) from continuing operations before income taxes (533,881) 96,935 (489,014) 106,650
Income tax provision (benefit) (113,413) 25,078 (99,275) 26,429
Income (loss) from continuing operations (420,468) 71,857 (389,739) 80,221
Income from discontinued operations before income taxes 6,067 2,889 13,524 15,554
Income tax provision 6,139 13,855 13,720 15,925
Loss from discontinued operations (72) (10,966) (196) (371)
Net income (loss) $ (420,540) $ 60,891 $ (389,935) $ 79,850
Basic earnings (loss) per common share:        
Income (loss) from continuing operations (in dollars per share) $ (3.88) $ 0.65 $ (3.61) $ 0.72
Loss from discontinued operations (in dollars per share) 0 (0.10) 0 0
Net income (loss) (in dollars per share) (3.88) 0.55 (3.61) 0.72
Diluted earnings (loss) per common share:        
Income (loss) from continuing operations (in dollars per share) (3.88) 0.65 (3.61) 0.72
Loss from discontinued operations (in dollars per share) 0 (0.10) 0 0
Net income (loss) (in dollars per share) $ (3.88) $ 0.55 $ (3.61) $ 0.72
Weighted average shares outstanding:        
Basic (in shares) 108,557 109,406 108,556 109,273
Diluted (in shares) 108,557 109,503 108,556 109,452