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Unaudited 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:        
Revenues $ 145,724 $ 146,245 $ 271,313 $ 365,939
Costs and expenses:        
Cost of revenues (exclusive of depreciation and amortization expense presented below) 117,632 128,083 219,942 325,685
Selling, general and administrative expense 22,092 23,992 43,317 50,116
Depreciation and amortization expense 20,909 24,646 42,429 51,055
Impairments of goodwill 0 0 0 406,056
Impairments of fixed and lease assets 2,794 2,992 3,444 8,190
Other operating income, net (85) (134) (439) (27)
Costs and expenses 163,342 179,579 308,693 841,075
Operating loss (17,618) (33,334) (37,380) (475,136)
Interest expense, net (2,699) (4,179) (5,024) (7,683)
Other income, net 1,820 5,994 5,780 6,768
Loss before income taxes (18,497) (31,519) (36,624) (476,051)
Income tax benefit 3,226 6,893 5,543 46,384
Net loss $ (15,271) $ (24,626) $ (31,081) $ (429,667)
Net loss per share:        
Basic (in dollars per share) $ (0.25) $ (0.41) $ (0.52) $ (7.19)
Diluted (in dollars per share) $ (0.25) $ (0.41) $ (0.52) $ (7.19)
Weighted average number of common shares outstanding:        
Basic (in shares) 60,317 59,839 60,207 59,747
Diluted (in shares) 60,317 59,839 60,207 59,747
Products        
Revenues:        
Revenues $ 78,038 $ 82,643 $ 139,483 $ 185,623
Costs and expenses:        
Cost of revenues (exclusive of depreciation and amortization expense presented below) 63,926 68,088 113,389 157,834
Services        
Revenues:        
Revenues 67,686 63,602 131,830 180,316
Costs and expenses:        
Cost of revenues (exclusive of depreciation and amortization expense presented below) $ 53,706 $ 59,995 $ 106,553 $ 167,851