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Discontinued Operations Statement of Operations for Discontinued Operations (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Sales $ 0 $ 0 $ 0 $ 0
Cost of sales (69) (1,716) (897) (2,423)
Total operating income (including restructuring) (26) (859) (1,146) (2,286)
Operating income from discontinued operations 95 2,575 2,043 4,709
Other income (loss) 214 (30) 377 339
Provision (benefit) for income taxes 309 2,545 2,420 5,048
Provision (benefit) for income taxes 130 (732) 147 (290)
Income from discontinued operations, net of income taxes $ 179 $ 3,277 $ 2,273 $ 5,338