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Business Combinations Purchase Price Allocation (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jan. 05, 2018
Business Acquisition [Line Items] |  |  |  |
Business Combination, Current Assets |  |  |  | $ 86,783
Business Combination, Property, Plant, and Equipment |  |  |  | 27,670
Business Combination, Other Noncurrent Assets | [1] |  |  | (1,578)
Business Combination, Intangibles Assets |  |  |  | 226,200
Acquired Intangible Assets, Weighted Average Useful Life |  | 8 years |  |
Business Combination, Intangible Assets, Other than Goodwill |  |  |  | 240,600
Goodwill acquired |  | $ 572,870 |  |
Business Combination, Current Liabilities |  |  |  | (91,301)
Intangible liabilities acquired |  | (23,900) | $ 0 |
Business Combination, Noncurrent Liabilities |  |  |  | (1,928)
SIlver Spring Networks, Inc. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill acquired |  | $ 572,900 |  |
Business Combination, Goodwill, and Liabilities Assumed, Net |  |  |  | 809,216
Core Developed Technology [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Intangibles Assets |  |  |  | 81,900
Acquired Intangible Assets, Weighted Average Useful Life |  | 5 years |  |
Customer Contracts And Relationships [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Intangibles Assets |  |  |  | 133,500
Acquired Intangible Assets, Weighted Average Useful Life |  | 10 years |  |
Intangible liabilities acquired |  | $ (23,900) |  |
Acquired Finite-lived Intangible Liabilities, Weighted Average Useful Life |  | 5 years |  |
Trademarks and Trade Names [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Intangibles Assets |  |  |  | 10,800
Acquired Intangible Assets, Weighted Average Useful Life |  | 3 years |  |
In Process Research and Development [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Intangibles Assets |  |  |  | $ 14,400
[1] | Reflects adjustments to deferred tax assets and liabilities, net as a result of the acquisition, and is classified as part of our overall consolidated deferred tax asset. This unfavorable deferred tax asset more than offsets the fair value of other noncurrent assets acquired.

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- Definition Amount of intangible assets, excluding goodwill, 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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