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Discontinued Operations - Income (Loss) From Discontinued Operations (Details) - Discontinued Operations, Held-for-sale - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Revenue:    
Revenue $ 106,256 $ 213,329
Operating expenses:    
Selling, general and administrative 6,812 17,514
Severance expense 254 465
Total operating expenses 31,526 68,087
Operating income 74,730 145,242
Interest expense and other, net (4,317) (8,701)
Income before income taxes 70,413 136,541
Income tax expense 18,847 36,503
Income from discontinued operations, net of tax 51,566 100,038
Service revenue and other    
Revenue:    
Revenue 100,402 201,076
Equipment revenue    
Revenue:    
Revenue 5,854 12,253
Cost of services    
Operating expenses:    
Cost of services and cost of goods sold 18,717 38,144
Cost of goods sold    
Operating expenses:    
Cost of services and cost of goods sold $ 5,743 $ 11,964