Note 5. Investment Partnerships (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Partnership interest, beginning	$ 577,637
Investment partnership gains (losses)	(24,968)	$ 78,973
Partnership interest, ending	546,170
Fair Value
Partnership interest, beginning	972,707	734,668
Investment partnership gains (losses)	(59,517)	115,894
Contributions (net of distributions) to investment partnerships	(5,015)	6,750
Partnership interest, ending	908,175	857,312
Company common Stock
Partnership interest, beginning	395,070	262,979
Investment partnership gains (losses)	(34,549)	36,921
Increase in proportionate share of Company stock held	1,484	10,930
Partnership interest, ending	362,005	310,830
Carrying Value
Partnership interest, beginning	577,637	471,689
Investment partnership gains (losses)	(24,968)	78,973
Contributions (net of distributions) to investment partnerships	(5,015)	6,750
Increase in proportionate share of Company stock held	(1,484)	(10,930)
Partnership interest, ending	$ 546,170	$ 546,482

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