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Note 12. Stock-Based Compensation Summary of Exercisable Stock Options (Details) - Options
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Exercisable Stock Options, Additional Disclosures  
Weighted Average Remaining Contractual Term 7 years 5 months
$15.00 to $50.00  
Exercisable Stock Options, Additional Disclosures  
Options Vested (a) | shares 1,980 [1]
Weighted Average Exercise Price | $ / shares $ 24.93
Aggregate Intrinsic Value | $ $ 24,700
$50.00 and above  
Exercisable Stock Options, Additional Disclosures  
Options Vested (a) | shares 90 [1]
Weighted Average Exercise Price | $ / shares $ 140.86
Aggregate Intrinsic Value | $ $ 0
[1] (a)Exercisable stock options as of December 31, 2015 have a weighted average remaining contractual life of 7.4 years.