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Consolidated Statement of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Product Information [Line Items]      
Revenue $ 3,511,509 $ 3,230,785 $ 3,190,174
Costs of revenue (2,534,682) (2,470,205) (2,429,852)
Gross profits 976,827 760,580 760,322
Corporate general and administrative expenses (141,066) (126,886) (145,596)
Gains on divestitures and impairment charges, net 7,009 32,919 15,933
Operating income 842,770 666,613 630,659
Interest expense (163,063) (185,843) (181,556)
Losses on early extinguishment of debt, net (18,428) (16,637) (10,131)
Other income, net 781 299 2,760
Income from continuing operations before income taxes 662,060 464,432 441,732
(Provision for) benefit from income taxes (145,923) (94,661) 5,826
Net income 516,137 369,771 447,558
Net income attributable to noncontrolling interests (230) (175) (350)
Net income attributable to common stockholders $ 515,907 $ 369,596 $ 447,208
Basic earnings per share:      
Net income attributable to common stockholders, basic $ 2.92 $ 2.03 $ 2.45
Basic weighted average number of shares 176,709 182,246 182,447
Diluted earnings per share:      
Net income attributable to common stockholders, diluted $ 2.88 $ 1.99 $ 2.39
Diluted weighted average number of shares 178,990 185,523 186,972
Product [Member]      
Product Information [Line Items]      
Revenue $ 1,772,778 $ 1,610,158 $ 1,584,242
Costs of revenue (867,215) (829,158) (811,574)
Service [Member]      
Product Information [Line Items]      
Revenue 1,513,420 1,379,001 1,374,380
Costs of revenue (749,695) (769,119) (752,488)
Product and Service, Other [Member]      
Product Information [Line Items]      
Revenue 225,311 241,626 231,552
Costs of revenue $ (917,772) $ (871,928) $ (865,790)