Goodwill and Identified Intangible Assets Goodwill and Identified Intangible Assets Narrative (Details)	3 Months Ended	6 Months Ended	12 Months Ended
	Dec. 31, 2014 segment	Jul. 01, 2016 USD ($) $ / shares	Dec. 31, 2016 USD ($) segment $ / shares	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Oct. 31, 2016 USD ($) $ / shares	Sep. 30, 2016 $ / shares
Goodwill [Line Items]
Market Capitalization		$ 235,000,000				$ 400,000,000
Goodwill, Acquired During Period			$ 41,670,000
Number of reportable segments | segment	2		2
Share Price | $ / shares		$ 3.01	$ 5.00			$ 5.10	$ 5.93
Finite-lived Intangible Assets Acquired			$ 39,500,000
Intangibles, net			$ 29,231,000	$ 4,097,000
Number of reporting units			2
Goodwill			$ 237,279,000	197,781,000
Goodwill, Impairment Loss			0	0	$ 0
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months			$ 8,272,000
Video [Member]
Goodwill [Line Items]
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount			67.00%
Goodwill, Acquired During Period			$ 41,670,000
Goodwill			$ 176,519,000	136,904,000
Cable Edge [Member]
Goodwill [Line Items]
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount			123.00%
Goodwill			$ 60,760,000	$ 60,877,000
TVN [Member]
Goodwill [Line Items]
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss)			1,600,000
Goodwill, Acquired During Period			41,700,000
Goodwill			41,670,000
Intangibles			41,100,000
Developed Technology Rights [Member] | TVN [Member]
Goodwill [Line Items]
Finite-Lived Intangible Asset, Useful Life		4 years
Intangibles			$ 21,700,000