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Business Combinations Revenue and Earnings Attributed to Business Combination (Details) - SIlver Spring Networks, Inc. [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2018
Business Acquisition [Line Items] |  |
Revenues | $ 89,789 | $ 249,315
Net loss | $ (10,738) | $ (54,411)

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