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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Revenues $ 195,615 $ 220,316 $ 391,046 $ 470,013
Total cost of sales (excluding depreciation and amortization) 88,877 92,076 176,025 205,718
Selling, general and administrative 26,077 28,745 51,161 59,371
Depreciation and amortization 44,193 48,849 89,905 98,671
Long-lived and other asset impairment 2,960 55,210 10,033 61,405
Goodwill impairment       99,830
Restructuring charges 743 2,408 1,640 4,136
Interest expense 25,958 25,778 57,203 55,443
Debt extinguishment loss   3,971   3,971
(Gain) loss on sale of assets, net (3,124) 2,189 (14,156) (1,927)
Other income, net (82) (438) (1,971) (993)
Income (loss) before income taxes 10,013 (38,472) 21,206 (115,612)
Provision for (benefit from) income taxes 1,261 (8,091) 8,285 (24,044)
Net income (loss) $ 8,752 $ (30,381) $ 12,921 $ (91,568)
Basic net income (loss) per common share (in dollars per share) $ 0.06 $ (0.20) $ 0.08 $ (0.61)
Diluted net income (loss) per common share (in dollars per share) $ 0.06 $ (0.20) $ 0.08 $ (0.61)
Weighted average common shares outstanding:        
Basic (in shares) 152,033 150,743 151,537 150,628
Diluted (in shares) 152,203 150,743 151,699 150,628
Contract Operations        
Revenues $ 163,865 $ 187,949 $ 329,899 $ 394,923
Total cost of sales (excluding depreciation and amortization) 61,387 63,390 122,752 142,041
Aftermarket Services        
Revenues 31,750 32,367 61,147 75,090
Total cost of sales (excluding depreciation and amortization) $ 27,490 $ 28,686 $ 53,273 $ 63,677