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Business Acquisitions and Divestiture - WIL Research Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Jul. 01, 2017
Dec. 31, 2016
Apr. 04, 2016
Business Acquisition [Line Items]      
Goodwill $ 776,453 $ 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