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Business Combinations - Business Combinations Purchase Price Allocation (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 05, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Schedule of Assets and Liabilities Acquired in a Business Combination [Line Items] |  |  |
Current Assets | $ 86,701 |  |
Property, plant, and equipment | $ 27,670 |  |
Weighted average useful life of property, plant and equipment acquired | 6 years |  |
Other long-term assets | $ 3,866 |  |
Identifiable intangible assets | 226,700 |  |
Weighted average useful life, acquired intangible assets |  | 8 years |
Total identified intangible assets | 241,100 |  |
Goodwill |  | $ 575,750 | $ 59,675
Current liabilities | (99,406) |  |
Customer contracts and relationships |  | (23,900) | $ 0
Long-term liabilities | (2,565) |  |
SIlver Spring Networks, Inc. [Member] |  |  |
Schedule of Assets and Liabilities Acquired in a Business Combination [Line Items] |  |  |
Goodwill |  | $ 575,800 |
Total net assets acquired | 809,216 |  |
Core Developed Technology [Member] |  |  |
Schedule of Assets and Liabilities Acquired in a Business Combination [Line Items] |  |  |
Identifiable intangible assets | 81,900 |  |
Weighted average useful life, acquired intangible assets |  | 5 years |
Customer Contracts And Relationships [Member] |  |  |
Schedule of Assets and Liabilities Acquired in a Business Combination [Line Items] |  |  |
Identifiable intangible assets | 134,000 |  |
Weighted average useful life, acquired intangible assets |  | 10 years |
Customer contracts and relationships | (23,900) |  |
Weighted average useful life, acquired intangible liabilities |  | 5 years |
Trademarks and Trade Names [Member] |  |  |
Schedule of Assets and Liabilities Acquired in a Business Combination [Line Items] |  |  |
Identifiable intangible assets | 10,800 |  |
Weighted average useful life, acquired intangible assets |  | 3 years |
In Process Research and Development [Member] |  |  |
Schedule of Assets and Liabilities Acquired in a Business Combination [Line Items] |  |  |
Identifiable intangible assets | $ 14,400 |  |

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