Acquisitions (Details) - USD ($) $ in Thousands	Jul. 02, 2014	Jul. 01, 2014	Jul. 30, 2016	Apr. 30, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Deferred Compensation Arrangement with Individual, Recorded Liability					$ 1,719
Business Combination, Indemnification Assets, Amount as of Acquisition Date	$ 6,000
Business Combination, Consideration Transferred, Escrow Released				$ 4,400
Videotel [Member]
Business Acquisition [Line Items]
Business Combination, Contingent Consideration, Liability	$ 47,446
Business combination, consideration transferred, percentage held in escrow		10.00%
Business combination, consideration transferred, period escrow held	21 months
Accounts receivable write-offs [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred, Escrow Released				$ 600
Subsequent Event [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred, Escrow Released			$ 1,600