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Business Acquisition Narratives (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Apr. 01, 2016
Dec. 31, 2016
Feb. 29, 2016
Business Acquisition [Line Items]          
Business Acquisition, Percentage of Voting Interests Acquired         100.00%
TVN [Member]          
Business Acquisition [Line Items]          
Business Acquisition, Percentage of Voting Interests Acquired         100.00%
Business Combination, Final Purchase Price   $ 82,512      
Business Combination, Acquisition and Integration Related Expenses $ 2,200   $ 3,100 $ 16,900