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Income Taxes: Winter Storm Uri (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred income tax liabilities, net	$ 465,388	$ 408,624
Internal Revenue Service (IRS)
Operating Loss Carryforwards, With no Expiration Date	607,465
Operating Loss Carryforwards	476,033
State and Local Jurisdiction
Operating Loss Carryforwards	572,203
Winter Storm Uri
Deferred income tax liabilities, net	124,000
Winter Storm Uri | Internal Revenue Service (IRS)
Operating Loss Carryforwards, With no Expiration Date	509,000
Winter Storm Uri | State and Local Jurisdiction
Operating Loss Carryforwards	$ 375,000

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