Commitments, Contingencies and Other Items (Details) $ in Thousands	1 Months Ended			6 Months Ended	12 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2021 USD ($) lawsuit	Feb. 28, 2017 USD ($) lawsuit	Jun. 30, 2023 USD ($) patent	Dec. 31, 2020 USD ($)
Loss Contingencies
Estimate of possible loss	$ 83,000			$ 83,000
Patents allegedly infringed | patent				1
Unfavorable Regulatory Action
Loss Contingencies
Estimate of possible loss	300			$ 300
Penalties Sought for Violation of Regulations And Laws of WUTC
Loss Contingencies
Damages awarded	$ 1,000
Penalties for Violation of Washington Regulations and Laws Filed by Staff of WUTC
Loss Contingencies
Damages sought, value					$ 7,000
Penalties Sought by Washington Attorney's General Office
Loss Contingencies
Damages sought, value					$ 27,000
Judicial Ruling | Missouri Municipalities
Loss Contingencies
Number of pending lawsuits | lawsuit		1	1
Litigation settlement amount			$ 4,000
Judicial Ruling | Columbia and Joplin Municipalities
Loss Contingencies
Litigation settlement amount		$ 55,000