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Acquisitions (Details) - USD ($) $ in Thousands | Jul. 02, 2014 | Jul. 01, 2014 | Jul. 30, 2016 | Apr. 30, 2016 | Dec. 31, 2015
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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 |  |  | $ 1,600 | $ 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 |

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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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- Definition The amount of indemnification assets (amounts to be reimbursed if and when certain assumed liabilities are paid) recognized at the acquisition date of a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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