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Business Acquisitions and Divestitures - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 27, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Identifiable intangibles | $ 85,000 |  |  |
Goodwill | 8,820,313 | $ 8,647,142 |  | $ 5,824,726
Deltek |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Accounts receivable |  |  | $ 94,506 |
Other current assets |  |  | 37,558 |
Identifiable intangibles | $ 972,000 |  | 972,000 |
Goodwill |  |  | 2,234,549 |
Other assets |  |  | 43,098 |
Total assets acquired |  |  | 3,381,711 |
Deferred revenue |  |  | 166,393 |
Other current liabilities |  |  | 57,433 |
Long-term deferred tax liability |  |  | 349,810 |
Other liabilities |  |  | 7,935 |
Net assets acquired |  |  | $ 2,800,140 |

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- Definition Amount of assets acquired at the acquisition date. + 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 (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + 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 (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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