Business Combinations - Business Combinations Purchase Price Allocation (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 05, 2018	Dec. 31, 2019	Dec. 31, 2018
Schedule of Assets and Liabilities Acquired in a Business Combination [Line Items]
Current Assets	$ 88,395
Property, plant, and equipment	$ 27,670
Weighted average useful life of property, plant and equipment acquired	6 years
Other long-term assets	$ 1,873
Identifiable intangible assets	226,700
Weighted average useful life, acquired intangible assets			8 years
Total identified intangible assets	241,100
Goodwill		$ 569,772
Current liabilities	(93,129)
Customer contracts and relationships		0	$ (23,900)
Long-term liabilities	(2,565)
SIlver Spring Networks, Inc. [Member]
Schedule of Assets and Liabilities Acquired in a Business Combination [Line Items]
Goodwill		$ 569,800
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