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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Revenues $ 195,431 $ 249,697
Total cost of sales (excluding depreciation and amortization) 87,148 113,642
Selling, general and administrative 25,084 30,626
Depreciation and amortization 45,712 49,822
Long-lived and other asset impairment 7,073 6,195
Goodwill impairment   99,830
Restructuring charges 897 1,728
Interest expense 31,245 29,665
Gain on sale of assets, net (11,032) (4,116)
Other income, net (1,889) (555)
Income (loss) before income taxes 11,193 (77,140)
Provision for (benefit from) income taxes 7,024 (15,953)
Net income (loss) $ 4,169 $ (61,187)
Basic and diluted net income (loss) per common share (in dollars per share) $ 0.03 $ (0.41)
Weighted average common shares outstanding:    
Basic (in shares) 151,425 150,550
Diluted (in shares) 151,578 150,550
Contract Operations    
Revenues $ 166,034 $ 206,974
Total cost of sales (excluding depreciation and amortization) 61,365 78,651
Aftermarket Services    
Revenues 29,397 42,723
Total cost of sales (excluding depreciation and amortization) $ 25,783 $ 34,991