XML 137 R121.htm IDEA: XBRL DOCUMENT v3.22.0.1
Income Taxes: Carryforwards, State and Foreign Tax Credits (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Tax Credit Carryforward [Line Items]      
Income Tax Expense (Benefit) $ 7,169 $ 32,918 $ 29,580
State and Local Jurisdiction      
Tax Credit Carryforward [Line Items]      
Tax Credit Carryforward, Valuation Allowance 13,600    
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 800    
Income Tax Expense (Benefit) 800    
State and Local Jurisdiction | Investment Tax Credit Carryforward      
Tax Credit Carryforward [Line Items]      
Deferred Tax Assets, State Tax Credits 23,060    
State and Local Jurisdiction | Research Tax Credit Carryforward      
Tax Credit Carryforward [Line Items]      
Deferred Tax Assets, State Tax Credits $ 282