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Income Taxes: Effective Tax Rate Differences From Statutory Tax Rates (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Federal Statutory Rate 21.00% 21.00% 21.00%
State income tax (net of federal tax effect) 2.40% 1.50% 2.30%
Non-controlling interest (1.20%) (1.20%) (1.30%)
Tax Credits (9.20%) (3.90%) (2.00%)
Flow-through adjustments (1.60%) (2.40%) (1.60%)
Jurisdictional simplification project 0.00% 0.00% (28.50%)
Uncertain Tax Benefits 1.50% 0.00% 0.00%
Valuation Allowance 0.70% 0.00% 0.00%
Other tax differences 0.60% (1.60%) (0.10%)
TCJA corporate rate reduction 0 0 0.016
Effective Income Tax Reconciliation, Amortization Of Excess Deferred Income Tax Expense (2.30%) (1.20%) (0.70%)
Effective Income Tax Rate, Continuing Operations 11.90% 12.20% (9.30%)
Deferred Income Tax Expense (Benefit) $ (38,091) $ (38,020) $ 24,239
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount     4,000
Other Restructuring      
Deferred Tax Assets, Goodwill and Intangible Assets     73,000
Deferred Income Tax Expense (Benefit)     $ 73,000