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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenues $ 195,166 $ 205,631 $ 586,212 $ 675,644
Total cost of sales (excluding depreciation and amortization) 91,932 86,153 267,957 291,871
Selling, general and administrative 28,839 18,681 80,000 78,052
Depreciation and amortization 45,280 47,279 135,185 145,950
Long-lived and other asset impairment 5,121 10,727 15,154 72,132
Goodwill impairment       99,830
Restructuring charges 313 2,900 1,953 7,036
Interest expense 25,508 25,221 82,711 80,664
Debt extinguishment loss       3,971
Gain on sale of assets, net (15,393) (9,146) (29,549) (11,073)
Other (income) expense, net 337 (324) (1,634) (1,317)
Income (loss) before income taxes 13,229 24,140 34,435 (91,472)
Provision for (benefit from) income taxes 3,925 5,808 12,210 (18,236)
Net income (loss) $ 9,304 $ 18,332 $ 22,225 $ (73,236)
Basic net income (loss) per common share (in dollars per share) $ 0.06 $ 0.12 $ 0.14 $ (0.49)
Diluted net income (loss) per common share (in dollars per share) $ 0.06 $ 0.12 $ 0.14 $ (0.49)
Weighted average common shares outstanding:        
Basic (in shares) 152,158 150,974 151,615 150,730
Diluted (in shares) 152,297 151,038 151,769 150,730
Contract Operations        
Revenues $ 158,911 $ 175,223 $ 488,810 $ 570,146
Total cost of sales (excluding depreciation and amortization) 61,280 60,444 184,032 202,485
Aftermarket Services        
Revenues 36,255 30,408 97,402 105,498
Total cost of sales (excluding depreciation and amortization) $ 30,652 $ 25,709 $ 83,925 $ 89,386