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Business Acquisitions and Divestiture - WIL Research Purchase Price Allocation (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Apr. 04, 2016
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 800,247 | $ 787,517 |
WIL Research |  |  |
Business Acquisition [Line Items] |  |  |
Trade receivables, contractual amount |  |  | $ 48,625
Trade receivables |  |  | 48,157
Inventories |  |  | 2,296
Other current assets (excluding cash) |  |  | 3,814
Property, plant and equipment |  |  | 129,066
Other long-term assets |  |  | 1,060
Definite-lived intangible assets |  |  | 164,800
Goodwill |  |  | 330,175
Deferred revenue |  |  | (39,103)
Other current liabilities |  |  | (27,386)
Long-term liabilities |  |  | (35,488)
Total purchase price allocation |  |  | $ 577,391

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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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