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Discontinued Operations - Income (Loss) From Discontinued Operations (Details) - Discontinued Operations, Disposed of by Sale - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Revenues [Abstract]        
Total revenue $ 110,825 $ 107,289 $ 334,710 $ 331,028
Operating expenses        
Selling, general and administrative 7,696 8,879 25,931 28,774
Depreciation and amortization 15,077 25,886 62,804 86,350
Total operating expenses 60,940 82,613 215,542 256,710
Total consolidated operating income (loss) 49,885 24,676 119,168 74,318
Other income:        
Interest expense (4,638) (7,442) (15,868) (22,877)
Other 130 44 391 130
Income before income taxes 45,377 17,278 103,691 51,571
Income tax expense (11,868) (4,092) (27,269) (13,441)
Income from discontinued operations, net of tax 33,509 13,186 76,422 38,130
Service revenue and other        
Revenues [Abstract]        
Total revenue 100,963 91,314 302,488 283,214
Equipment revenue        
Revenues [Abstract]        
Total revenue 9,862 15,975 32,222 47,814
Cost of services        
Operating expenses        
Cost of services and cost of goods sold 28,567 32,277 95,242 95,846
Cost of goods sold        
Operating expenses        
Cost of services and cost of goods sold $ 9,600 $ 15,571 $ 31,565 $ 45,740