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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
OPERATING REVENUES    
Drilling services $ 674,613 $ 674,565
Other 2,689 2,582
Total operating revenues 677,302 677,147
OPERATING COSTS AND EXPENSES    
Drilling services operating expenses, excluding depreciation and amortization 411,857 403,303
Other operating expenses 1,156 1,137
Depreciation and amortization 99,080 93,991
Research and development 9,359 8,608
Selling, general and administrative 63,062 56,577
Acquisition transaction costs 10,535 0
Gain on reimbursement of drilling equipment (9,403) (7,494)
Other (gain) loss on sale of assets 1,673 (2,443)
Total operating costs and expenses 587,319 553,679
OPERATING INCOME 89,983 123,468
Other income (expense)    
Interest and dividend income 21,741 10,734
Interest expense (22,298) (4,372)
Loss on investment securities (13,367) (4,034)
Other 360 (543)
Nonoperating Income (Expense), Total (13,564) 1,785
Income before income taxes 76,419 125,253
Income tax expense 21,647 30,080
NET INCOME $ 54,772 $ 95,173
Basic earnings per common share    
Net income (loss) (in dollars per share) $ 0.55 $ 0.95
Diluted earnings per common share:    
Net income (in dollars per share) $ 0.54 $ 0.94
Weighted average shares outstanding:    
Basic (in shares) 98,867 99,143
Diluted (in shares) 99,159 99,628