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Business Combinations - Business Combinations Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Jan. 05, 2018
Business Acquisition [Line Items]
Percentage of voting interests acquired			100.00%
Silver Spring Networks, Inc. acquisition purchase price, net of cash acquired		$ 802,500
Goodwill	$ 569,772
SIlver Spring Networks, Inc. [Member]
Business Acquisition [Line Items]
Percentage of voting interests acquired			100.00%
Total net assets acquired			$ 809,216
Cash acquired from acquisition		97,800
Business acquisition, equity interest issued, or issuable, value			$ 6,700
Goodwill	569,800
Acquisition related costs	$ 26,600	$ 91,900