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Income Tax (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income from discontinued operations, net of tax $ 0 $ 74 $ 5,494 $ 249
Loss from continuing operations, net of tax (350) (2,846) (1,738) (5,097)
Income tax expense (benefit), continued operations (106) (88) (561) 519
Unrecognized tax benefits 3,900   3,900  
Unrecognized tax benefits that would impact effective tax rate 3,500   3,500  
MDSS post-warranty service business | Discontinued operations, disposed of by sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income from discontinued operations, net of tax 0 74 5,494 249
Income tax expense, discontinued operations $ 135 $ 97 714 $ 276
Operating loss carryforward | MDSS post-warranty service business | Discontinued operations, disposed of by sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Operating losses utilized, decrease in deferred tax assets valuation allowance     $ 1,100