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Discontinued Operations - Income (Loss) From Discontinued Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Operating expenses |  |  |  |
Discontinued operations expense | $ 254 | $ 0 | $ 465 | $ 0
Discontinued Operations, Held-for-sale |  |  |  |
Revenue: |  |  |  |
Revenue | 106,256 | 119,748 | 213,329 | 223,886
Operating expenses |  |  |  |
Selling, general and administrative | 6,812 | 9,348 | 17,514 | 18,278
Depreciation and amortization | 0 | 22,901 | 0 | 47,727
Total operating expenses | 31,526 | 74,878 | 68,087 | 154,601
Operating income | 74,730 | 44,870 | 145,242 | 69,285
Other (expense) income: |  |  |  |
Interest expense | (4,317) | (4,742) | (8,701) | (10,970)
Income before income taxes | 70,413 | 40,128 | 136,541 | 58,315
Income tax expense | 18,847 | 10,345 | 36,503 | 15,402
Income from discontinued operations, net of tax | 51,566 | 29,783 | 100,038 | 42,913
Discontinued Operations, Held-for-sale | Service revenue and other |  |  |  |
Revenue: |  |  |  |
Revenue | 100,402 | 110,138 | 201,076 | 201,526
Discontinued Operations, Held-for-sale | Equipment revenue |  |  |  |
Revenue: |  |  |  |
Revenue | 5,854 | 9,610 | 12,253 | 22,360
Discontinued Operations, Held-for-sale | Cost of services |  |  |  |
Operating expenses |  |  |  |
Cost of services and cost of goods sold | 18,717 | 33,192 | 38,144 | 66,631
Discontinued Operations, Held-for-sale | Cost of goods sold |  |  |  |
Operating expenses |  |  |  |
Cost of services and cost of goods sold | $ 5,743 | $ 9,437 | $ 11,964 | $ 21,965

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