Note 23. Other Comprehensive Income (loss): Schedule Of Other Comprehensive Income Reclassifications By Component (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments and Tax	$ 15,475	$ 18,783	$ 17,964
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax	(5,133)	(6,117)	(6,398)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax	10,342	12,666	11,566
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax	(3,146)	(4,926)	(3,585)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax	10,827	11,345	12,309
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax	(3,631)	(3,605)	(4,328)
Change in unrealized gains (losses) on available-for-sale securities, net of tax	7,196	7,740	7,981
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	131	(494)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	(52)	197
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	79	(297)
Other Comprehensive Income (Loss), before Tax	10,958	10,851	12,309
Other Comprehensive Income (Loss), Tax	(3,683)	(3,408)	(4,328)
Other Comprehensive Income (Loss), Net of Tax	7,275	7,443	7,981
Net realized investment gains
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, before Tax	(5,352)	(8,961)	(9,474)
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Tax	1,684	3,026	3,433
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax	(3,668)	(5,935)	(6,041)
Net impairment losses recognized in earnings
Other Comprehensive Income (Loss), Reclassification Adjustment for Write-down of Securities Included in Net Income, before Tax	704	1,523	3,819
Other Comprehensive Income (Loss), Reclassification Adjustment for Write-down of Securities Included in Net Income, Tax	(182)	(514)	(1,363)
Other Comprehensive Income (Loss), Reclassification Adjustment for Write-down of Securities Included in Net Income, Net of Tax	$ 522	$ 1,009	$ 2,456