Note 4. Investments: Schedule of Unrealized Loss on Investments (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Available For Sale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than 12 Months	36	14
Available For Sale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions More Than 12 Months	1	1
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	37	15
Corporate Debt Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 22,585	$ 12,378
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	1,050	112
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	22,585	12,378
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	1,050	112
Foreign Government Debt Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,345
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	115
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,345
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	115
Commercial Mortgage Backed Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	228	228
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	162	162
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	228	228
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	162	162
US Treasury Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	3,161
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	66
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	3,161
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	66
US Government Agencies Debt Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	118
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	118
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	1
US Government-sponsored Enterprises Debt Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	378
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	10
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	378
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	10
US States and Political Subdivisions Debt Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	18,800	3,760
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	406	21
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	18,800	3,760
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	406	21
Debt Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	46,387	16,138
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	1,648	133
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	228	228
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	162	162
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	46,615	16,366
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	$ 1,810	$ 295