Note 5. Investments: Schedule of Unrealized Loss on Investments (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 13,550	$ 41,416
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	172	499
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	2,943	8,168
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	255	376
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	16,493	49,584
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	$ 427	$ 875
Available For Sale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than 12 Months	11	36
Available For Sale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions More Than 12 Months	4	7
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	15	43
Corporate Debt Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 4,394	$ 24,627
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	53	387
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,535	6,760
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	179	296
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	5,929	31,387
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	232	683
Foreign Government Debt Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	3,253	484
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	42	6
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	3,253	484
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	42	6
US States and Political Subdivisions Debt Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	4,581	13,013
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	73	98
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,408	1,408
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	76	80
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	5,989	14,421
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	149	178
Nonredeemable Preferred Stock
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,322	1,324
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	4	3
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,322	1,324
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	$ 4	3
US Treasury Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		995
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss		4
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		995
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss		4
US Government-sponsored Enterprises Debt Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		973
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss		1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		973
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss		$ 1