Note 7. Net Realized Investment Gains (losses) (Details) (USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended
Jan. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Details
Available-for-sale Securities, Gross Realized Gains		$ 4,632	$ 3,290
Available for sale Securities Gross Realized Losses Excluding Other Than Temporary Impairments		68	2,540
Available For Sale Securities Transfers To Trading Gross Gains	287
Available For Sale Securities Transfers To Trading Gross Losses	$ 149

This item represents the gross amount of losses included in earnings from transfers of securities from the available-for-sale category into the trading category. Such losses represent the unrealized losses included in other comprehensive income associated with the securities transferred from the available-for-sale category to the trading category.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 21

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration