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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Revenue $ 253,367 $ 213,668 $ 730,744 $ 626,697
Total cost of sales (excluding depreciation and amortization) 111,961 107,527 336,727 310,731
Selling, general and administrative 28,558 30,500 83,632 85,964
Depreciation and amortization 42,155 39,953 123,546 124,348
Long-lived and other asset impairment 2,922 4,154 8,383 16,217
Restructuring charges 592   1,554  
Interest expense 28,339 25,177 83,550 74,879
Gain on sale of assets, net (3,237) (12,695) (8,018) (33,755)
Other expense (income), net (235) (585) 1,831 (52)
Income before income taxes 42,312 19,637 99,539 48,365
Provision for income taxes 11,454 4,266 27,543 14,527
Net income $ 30,858 $ 15,371 $ 71,996 $ 33,838
Basic earnings per common share (in dollars per share) $ 0.20 $ 0.10 $ 0.46 $ 0.21
Diluted earnings per common share(in dollars per share) $ 0.20 $ 0.10 $ 0.46 $ 0.21
Weighted average common shares outstanding:        
Basic (in shares) 154,163 153,550 154,210 153,168
Diluted (in shares) 154,401 153,687 154,398 153,297
Contract operations        
Revenue $ 207,552 $ 170,497 $ 596,417 $ 500,451
Total cost of sales (excluding depreciation and amortization) 75,273 71,694 230,788 204,550
Aftermarket services        
Revenue 45,815 43,171 134,327 126,246
Total cost of sales (excluding depreciation and amortization) $ 36,688 $ 35,833 $ 105,939 $ 106,181