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Business Combinations Purchase Price Allocation (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Jan. 05, 2018
Business Acquisition [Line Items] |  |  |  |
Business Combination, Current Assets |  |  |  | $ 86,962
Business Combination, Property, Plant, and Equipment |  |  |  | 27,670
Business Combination, Other Noncurrent Assets | [1] |  |  | (830)
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 |  | $ 572,499 |  |
Business Combination, Current Liabilities |  |  |  | (91,857)
Finite-Lived Intangible Liabilities Acquired |  | (23,900) | $ 0 |
Business Combination, Noncurrent Liabilities |  |  |  | 1,928
SIlver Spring Networks, Inc. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill acquired |  | 572,500 |  |
Business Combination, Goodwill, and Liabilities Assumed, Net |  |  |  | 809,216
Business Acquisition, Transaction Costs |  | $ 15,600 |  |
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 |  |
Finite-Lived 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 negative deferred tax asset more than offsets the fair value of other noncurrent assets acquired.

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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- Definition Amount of assets that are expected to be realized or consumed 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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- Definition Amount of liabilities due within one year or within the normal operating cycle, if longer, assumed 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 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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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464 Reference 2: 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 of liabilities due after one year or the normal operating cycle, if longer, assumed 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 of other assets expected to be realized or consumed after 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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- Definition The amount of property, plant, and equipment recognized as of 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464 + Details
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- Definition Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed. + 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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