Discontinued Operations - Income (Loss) From Discontinued Operations (Details) - Discontinued Operations, Held-for-sale $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)
Revenue:
Revenue	$ 107,073
Operating expenses:
Selling, general and administrative	10,702
Severance expense	211
Total operating expenses	36,561
Operating income	70,512
Interest expense and other, net	(4,384)
Income before income taxes	66,128
Income tax expense	17,656
Income from discontinued operations, net of tax	48,472
Service revenue and other
Revenue:
Revenue	100,674
Equipment revenue
Revenue:
Revenue	6,399
Cost of services
Operating expenses:
Cost of services and cost of goods sold	19,427
Cost of goods sold
Operating expenses:
Cost of services and cost of goods sold	$ 6,221