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Acquisition and Divestitures - Consideration Transferred (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Oct. 17, 2017 | Mar. 01, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |  |  |
Issuance of common stock in connection with Openwave acquisition |  |  |  | $ 22,000 |
Intralinks Holdings, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash consideration for outstanding common shares | $ 746,071 |  |  |  |
Issuance of common stock in connection with Openwave acquisition | 977,300 |  | $ 4,700 | 0 | $ 0
Cash consideration for accelerated equity awards to Intralinks’ employees upon change in control | 7,873 |  |  |  |
Cash consideration for vested unexercised Intralinks’ stock options | 19,838 |  |  |  |
Cash consideration for existing Intralinks’ debt | 77,800 |  |  |  |
Cash consideration for shareholders purchase price settlement | 2,794 |  |  |  |
Total cash consideration transferred | 854,376 |  |  |  |
Fair value of replacement awards | 4,702 |  |  |  |
Consideration transferred | $ 859,078 |  |  |  |
Openwave Messaging |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash consideration for outstanding common shares |  | $ 102,538 |  |  |
Issuance of common stock in connection with Openwave acquisition |  | 22,000 | $ 0 | $ 22,000 | $ 0
Intellectual Property Settlement |  | (10,000) |  |  |
Total cash consideration transferred |  | 92,538 |  |  |
Consideration transferred |  | $ 114,538 |  |  |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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