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Discontinued Operations (Narrative) (Details)
$ in Millions
Dec. 28, 2015
USD ($)
firm
shares
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Number of venture firms invested in Lifesize | firm 3
Lifesize | Series B Preferred Stock  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Number of shares sold in transaction (in shares) 17,500,000
Proceeds from sale of shares | $ $ 17.5
Percentage of ownership from investor 62.50%
Lifesize | Registered shares  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Number of shares reserved for issuance under a stock plan (in shares) 8,000,000
Lifesize  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Ownership after transaction 37.50%
Lifesize | Series B Preferred Stock  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Number of shares sold in transaction (in shares) 2,500,000
Proceeds from sale of shares | $ $ 2.5
Lifesize | Series A Preferred Stock  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Number of shares retained (in shares) 12,000,000
Level 3 | Lifesize | Fair Value, Measurements, Nonrecurring  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Cost method investments | $ $ 5.6
Fair value inputs, volatility rate 50.00%
Expected term to exit 3 years
Discount for lack of marketability 27.00%