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Discontinued Operations - Disposal Groups, Including Discontinued Operations (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Discontinued Operations And Disposal Groups [Abstract]  
Service revenue $ 699
Product sales 1,768
Total revenue 2,467
Cost of services, exclusive of depreciation expense shown below 345
Cost of product sales, exclusive of depreciation expense shown below 1,642
Other Expense (income) (26)
Operating income (loss) 506
Income tax expense (benefit) 247
Income (loss) from discontinued operations, net of income taxes $ 259