Consolidated Statements of Equity Statement - USD ($) shares in Thousands, $ in Thousands	Total	Parent [Member]	Parent [Member] SIlver Spring Networks, Inc. [Member]	Common Stock [Member]	Common Stock Including Additional Paid in Capital [Member]	Common Stock Including Additional Paid in Capital [Member] SIlver Spring Networks, Inc. [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Noncontrolling Interest [Member]
Beginning balance (in shares) at Dec. 31, 2020				40,444
Beginning balance at Dec. 31, 2020	$ 840,273	$ 816,548			$ 1,389,419		$ (138,526)	$ (434,345)	$ 23,725
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	13,580	12,603						12,603	977
Other comprehensive income (loss), net of tax	(11,783)	(11,783)					(11,783)
Net stock issuance and repurchases (in shares)				206
Net stock issued and repurchased	2,009	2,009			2,009
Stock-based compensation expense	6,270	6,270			6,270
Stock issued related to equity offering				4,472
Stock issued related to equity offering	389,419	389,419			389,419
Proceeds from sale of warrants	45,349	45,349			45,349
Purchases of convertible note hedge contracts, net of tax	63,576	63,576			63,576
Registration fee			$ (373)			$ (373)
Ending balance at Mar. 31, 2021	1,221,168	1,196,466			1,768,517		(150,309)	(421,742)	24,702
Ending balance (in shares) at Mar. 31, 2021				45,122
Beginning balance (in shares) at Dec. 31, 2020				40,444
Beginning balance at Dec. 31, 2020	840,273	816,548			1,389,419		(138,526)	(434,345)	23,725
Ending balance at Dec. 31, 2021	$ 1,142,759	1,116,077			1,779,775		(148,098)	(515,600)	26,682
Ending balance (in shares) at Dec. 31, 2021	45,152			45,152
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 896	906						906	(10)
Other comprehensive income (loss), net of tax	52,815	52,815					52,815
Net stock issuance and repurchases (in shares)				165
Net stock issued and repurchased	784	784			784
Stock-based compensation expense	$ 6,127	6,127			6,127
Stock repurchased during period (in shares)	(280)
Stock repurchased program	$ (16,629)	(16,629)			(16,629)
Proceeds from sale of warrants	0
Ending balance at Mar. 31, 2022	$ 1,186,752	$ 1,160,080			$ 1,770,057		$ (95,283)	$ (514,694)	$ 26,672
Ending balance (in shares) at Mar. 31, 2022	45,037			45,037