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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Operating revenues        
Drilling services $ 329,774 $ 314,405 $ 868,581 $ 1,556,093
Other 2,439 2,959 6,180 9,567
Total operating revenues 332,213 317,364 874,761 1,565,660
Operating costs and expenses        
Drilling services operating expenses, excluding depreciation and amortization 255,471 205,198 684,473 1,022,270
Other operating expenses 1,481 1,549 4,117 4,286
Depreciation and amortization 104,493 110,161 317,771 372,298
Research and development 5,610 3,638 16,527 16,730
Selling, general and administrative 41,719 43,108 120,371 134,894
Asset impairment charge 2,130 0 56,414 563,234
Restructuring charges 2,110 15,495 3,856 15,495
(Gain) loss on sale of assets (3,434) (4,201) 2,745 (18,790)
Total operating costs and expenses 409,580 374,948 1,206,274 2,110,417
Operating loss from continuing operations (77,367) (57,584) (331,513) (544,757)
Other income (expense)        
Interest and dividend income 1,527 771 8,225 6,551
Interest expense (5,963) (6,125) (17,861) (18,320)
Gain (loss) on investment securities 2,409 2,267 7,853 (7,325)
Gain on sale of subsidiary 0 0 0 14,963
Other (970) (2,914) (3,027) (3,711)
Total other income (expense) (2,997) (6,001) (4,810) (7,842)
Loss from continuing operations before income taxes (80,364) (63,585) (336,323) (552,599)
Income tax benefit (23,659) (17,578) (78,398) (116,853)
Loss from continuing operations (56,705) (46,007) (257,925) (435,746)
Income from discontinued operations before income taxes 1,150 9,151 10,936 22,675
Income tax provision 0 8,743 0 22,463
Income from discontinued operations 1,150 408 10,936 212
Net loss $ (55,555) $ (45,599) $ (246,989) $ (435,534)
Basic earnings (loss) per common share:        
Loss from continuing operations (in dollars per share) $ (0.53) $ (0.43) $ (2.40) $ (4.05)
Income from discontinued operations (in dollars per share) 0.01 0 0.10 0
Net loss (in dollars per share) (0.52) (0.43) (2.30) (4.05)
Diluted earnings (loss) per common share:        
Loss from continuing operations (in dollars per share) (0.53) (0.43) (2.40) (4.05)
Income from discontinued operations (in dollars per share) 0.01 0 0.10 0
Net loss (in dollars per share) $ (0.52) $ (0.43) $ (2.30) $ (4.05)
Weighted average shares outstanding:        
Basic (in shares) 107,896 107,439 107,790 108,185
Diluted (in shares) 107,896 107,439 107,790 108,185