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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Operating revenues    
Contract drilling services $ 611,398 $ 737,358
Other 3,259 3,240
Total operating revenues 614,657 740,598
Operating costs and expenses    
Contract drilling services operating expenses, excluding depreciation and amortization 389,206 487,593
Other operating expenses 11,545 1,274
Depreciation and amortization 130,131 141,460
Research and development 6,878 7,019
Selling, general and administrative 49,808 54,508
Gain on sale of assets (4,279) (5,545)
Total operating costs and expenses 583,289 686,309
Operating income from continuing operations 31,368 54,289
Other income (expense)    
Interest and dividend income 2,214 2,450
Interest expense (6,100) (4,720)
Gain (loss) on investment securities 2,821 (42,844)
Gain on sale of subsidiary 14,963 0
Other (399) 541
Total other income (expense) 13,499 (44,573)
Income from continuing operations before income taxes 44,867 9,716
Income tax provision 14,138 1,352
Income from continuing operations 30,729 8,364
Income from discontinued operations before income taxes 7,457 12,665
Income tax provision 7,581 2,070
Income (loss) from discontinued operations (124) 10,595
Net income $ 30,605 $ 18,959
Basic earnings per common share:    
Income from continuing operations (in dollars per share) $ 0.27 $ 0.07
Income from discontinued operations (in dollars per share) 0 0.10
Net income (in dollars per share) 0.27 0.17
Diluted earnings per common share:    
Income from continuing operations (in dollars per share) 0.27 0.07
Income from discontinued operations (in dollars per share) 0 0.10
Net income (in dollars per share) $ 0.27 $ 0.17
Weighted average shares outstanding:    
Basic (in shares) 108,555 109,142
Diluted (in shares) 108,724 109,425