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Goodwill Silver Spring Acquisition (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2019 | Dec. 31, 2018 | Jan. 05, 2018
Business Acquisition [Line Items] |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  | 100.00%
Payments to acquire businesses, gross |  | $ 802,500 |  |  |
Measurement period adjustments to goodwill acquired | $ (6,000) |  | $ (5,978) |  |
Deferred Tax Liabilities, Goodwill | 2,000 |  |  |  |
SIlver Spring Networks, Inc. [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase price, net of cash |  |  |  |  | $ 809,200
Cash acquired from acquisition |  |  |  | $ 97,800 |
Equity interest issued |  |  |  |  | $ 6,700
Measurement period adjustments to goodwill acquired | $ (8,000) |  |  |  |

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- Definition Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e961-128460 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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