Discontinued Operations - Narrative (Details) - AutoMD - Discontinued Operations, Disposed of by Means Other than Sale - USD ($) $ in Thousands	3 Months Ended
Apr. 01, 2017	Apr. 02, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Severance costs	$ 221
Contract termination cost	164
Loss from operations	173
Net loss attributable to noncontrolling interest	$ 59	$ 262

Amount after tax of income (loss) from a discontinued operation attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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