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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:      
Revenues $ 573,161 $ 638,075 $ 1,017,354
Costs and expenses:      
Cost of revenues (exclusive of depreciation and amortization expense presented below) 470,396 561,805 802,589
Selling, general and administrative expense 83,692 94,102 122,932
Depreciation and amortization expense 80,741 98,543 123,319
Impairments of goodwill 0 406,056 165,000
Impairments of fixed and lease assets 4,166 12,447 33,697
Other operating income, net (1,042) (538) (2,003)
Costs and expenses 637,953 1,172,415 1,245,534
Operating loss (64,792) (534,340) (228,180)
Interest expense (10,328) (14,259) (17,898)
Interest income 158 390 262
Other income, net 1,628 13,880 5,089
Loss before income taxes (73,334) (534,329) (240,727)
Income tax benefit 9,341 65,946 8,919
Net loss $ (63,993) $ (468,383) $ (231,808)
Net loss per share:      
Basic (in dollars per share) $ (1.06) $ (7.83) $ (3.90)
Diluted (in dollars per share) $ (1.06) $ (7.83) $ (3.90)
Weighted average number of common shares outstanding:      
Basic (in shares) 60,293 59,812 59,379
Diluted (in shares) 60,293 59,812 59,379
Products      
Revenues:      
Revenues $ 299,293 $ 331,272 $ 483,359
Costs and expenses:      
Cost of revenues (exclusive of depreciation and amortization expense presented below) 246,589 287,615 369,194
Services      
Revenues:      
Revenues 273,868 306,803 533,995
Costs and expenses:      
Cost of revenues (exclusive of depreciation and amortization expense presented below) $ 223,807 $ 274,190 $ 433,395