Note 4. Investments: Schedule of Unrealized Loss on Investments (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	$ 68,502	$ 192,696
Available for sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses2	801	2,819
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	40,063	52,850
Available for sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses2	1,193	3,206
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	108,565	245,546
Available for sale Securities Continuous Unrealized Loss Position Aggregate Losses2	1,994	6,025
Corporate Debt Securities
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	26,265	128,820
Available for sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses2	367	1,989
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	14,223	9,451
Available for sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses2	358	87
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	40,488	138,271
Available for sale Securities Continuous Unrealized Loss Position Aggregate Losses2	725	2,076
Residential Mortgage Backed Securities Member
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	9	1,396
Available for sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses2	29	176
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	1,868	14,597
Available for sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses2	114	1,368
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	1,877	15,993
Available for sale Securities Continuous Unrealized Loss Position Aggregate Losses2	143	1,544
Commercial Mortgage Backed Securities
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	560	538
Available for sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses2	415	910
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	560	538
Available for sale Securities Continuous Unrealized Loss Position Aggregate Losses2	415	910
US Treasury Securities
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	3,765
Available for sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses2	2
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	3,765
Available for sale Securities Continuous Unrealized Loss Position Aggregate Losses2	2
US Government-sponsored Enterprises Debt Securities
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	5,817	15,134
Available for sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses2	22	131
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	419	2,367
Available for sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses2	8	30
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	6,236	17,501
Available for sale Securities Continuous Unrealized Loss Position Aggregate Losses2	30	161
US States and Political Subdivisions Debt Securities
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	30,877	43,978
Available for sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses2	323	291
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	22,993	20,929
Available for sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses2	298	360
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	53,870	64,907
Available for sale Securities Continuous Unrealized Loss Position Aggregate Losses2	621	651
Debt Securities
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	66,733	189,328
Available for sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses2	743	2,587
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	40,063	47,882
Available for sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses2	1,193	2,755
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	106,796	237,210
Available for sale Securities Continuous Unrealized Loss Position Aggregate Losses2	1,936	5,342
COMMON STOCK
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	861	1,724
Available for sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses2	55	149
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	861	1,724
Available for sale Securities Continuous Unrealized Loss Position Aggregate Losses2	55	149
Nonredeemable Preferred Stock
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	908
Available for sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses2	3
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value		4,968
Available for sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses2		451
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	908	4,968
Available for sale Securities Continuous Unrealized Loss Position Aggregate Losses2	3	451
Redeemable Preferred Stock
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value		1,644
Available for sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses2		83
Available For Sale Securities Continuous Unrealized Loss Position Fair Value		1,644
Available for sale Securities Continuous Unrealized Loss Position Aggregate Losses2		$ 83