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Note 5. Investments (Details) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 12 Months Ended
Jan. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Details        
Available-for-sale Securities, Gross Realized Gains   $ 1,377 $ 937 $ 1,042
Available-for-sale Securities, Gross Realized Losses   306 353 522
Available-for-sale Securities, Transfers to Trading, Gross Gains 42      
Available-for-sale Securities, Transfers to Trading, Gross Losses 22      
Other Than Temporary Impairment Losses Investments Portion Recognized in Earnings Available For Sale Securities Debt Securities Credit Losses   $ 0 $ 189 $ 89