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Income Taxes: Tax Benefit Related to Legal Restructuring (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deferred Income Tax Expense (Benefit)     $ (24,239) $ 80,992 $ 82,704
Other Restructuring          
Deferred Tax Assets, Goodwill and Intangible Assets $ 73,000   73,000    
Deferred Income Tax Expense (Benefit) $ 23,000 $ 49,000 $ 73,000