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Discontinued Operations Discontinued Operations - Schedule of Discontinued Operations (Details) - USD ($)
 12 Months Ended
Jul. 06, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net income (loss) from discontinued operations   $ 0 $ (255,000) $ 79,410,000
Stock-based compensation expense   0 0 1,533,000
Capital expenditures   0 0 482,000
Sisd [Member] | Discontinued Operations, Disposed of by Sale [Member]        
Revenue   0 0 23,248,000
Cost of revenue   0 0 (11,291,000)
Research, development, and engineering expenses   0 0 (2,126,000)
Selling, general, and administrative expenses   0 0 (7,800,000)
Foreign currency loss   0 0 (177,000)
Operating income from discontinued business   0 0 1,854,000
Gain (loss) on sale of discontinued business $ 125,357,000 0 (404,000) 125,357,000
Income from discontinued operations before income tax expense   0 (404,000) 127,211,000
Income tax expense (benefit) on discontinued operations $ 47,175,000 0 (149,000) 47,801,000
Net income (loss) from discontinued operations   0 (255,000) 79,410,000
Stock-based compensation expense   0 0 1,533,000
Depreciation expense   0 0 401,000
Amortization expense   0 0 165,000
Capital expenditures   $ 0 $ 0 $ 482,000