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Unaudited 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:        
Revenues $ 140,528 $ 134,759 $ 411,841 $ 500,698
Costs and expenses:        
Cost of revenues (exclusive of depreciation and amortization expense presented below) 117,207 120,611 337,149 446,296
Selling, general and administrative expense 20,078 21,389 63,395 71,505
Depreciation and amortization expense 19,657 24,251 62,086 75,306
Impairments of goodwill 0 0 0 406,056
Impairments of fixed and lease assets 0 0 3,444 8,190
Other operating income, net (275) (652) (714) (679)
Costs and expenses 156,667 165,599 465,360 1,006,674
Operating loss (16,139) (30,840) (53,519) (505,976)
Interest expense, net (2,569) (3,549) (7,593) (11,232)
Other income, net 2,137 6,744 7,917 13,512
Loss before income taxes (16,571) (27,645) (53,195) (503,696)
Income tax benefit 3,529 7,676 9,072 54,060
Net loss $ (13,042) $ (19,969) $ (44,123) $ (449,636)
Net loss per share:        
Basic (in dollars per share) $ (0.22) $ (0.33) $ (0.73) $ (7.52)
Diluted (in dollars per share) $ (0.22) $ (0.33) $ (0.73) $ (7.52)
Weighted average number of common shares outstanding:        
Basic (in shares) 60,377 59,871 60,264 59,788
Diluted (in shares) 60,377 59,871 60,264 59,788
Products        
Revenues:        
Revenues $ 70,409 $ 72,598 $ 209,892 $ 258,221
Costs and expenses:        
Cost of revenues (exclusive of depreciation and amortization expense presented below) 60,310 66,789 173,699 224,623
Services        
Revenues:        
Revenues 70,119 62,161 201,949 242,477
Costs and expenses:        
Cost of revenues (exclusive of depreciation and amortization expense presented below) $ 56,897 $ 53,822 $ 163,450 $ 221,673