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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenues $ 781,461 $ 874,970 $ 965,485
Total cost of sales (excluding depreciation and amortization) 358,917 377,193 456,238
Selling, general and administrative 107,167 105,100 117,727
Depreciation and amortization 178,946 193,138 188,084
Long-lived and other asset impairment 21,397 79,556 44,663
Goodwill impairment   99,830  
Restatement and other charges     445
Restructuring charges 2,903 8,450  
Interest expense 108,135 105,716 104,681
Debt extinguishment loss   3,971 3,653
Transaction-related costs     8,213
Gain on sale of assets, net (30,258) (10,643) (16,016)
Other income, net (4,707) (1,359) (661)
Income (loss) before income taxes 38,961 (85,982) 58,458
Provision for (benefit from) income taxes 10,744 (17,537) (39,145)
Income (loss) from continuing operations 28,217 (68,445) 97,603
Loss from discontinued operations, net of tax     (273)
Net income (loss) $ 28,217 $ (68,445) $ 97,330
Basic net income (loss) per common share (in dollars per share) $ 0.18 $ (0.46) $ 0.70
Diluted net income (loss) per common share (in dollars per share) $ 0.18 $ (0.46) $ 0.70
Weighted average common shares outstanding:      
Basic (in shares) 151,684 150,828 137,492
Diluted (in shares) 151,830 150,828 137,528
Contract Operations      
Revenues $ 648,311 $ 738,918 $ 771,539
Total cost of sales (excluding depreciation and amortization) 244,486 261,087 297,260
Aftermarket Services      
Revenues 133,150 136,052 193,946
Total cost of sales (excluding depreciation and amortization) $ 114,431 $ 116,106 $ 158,978