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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, 2016 USD ($) $ / shares shares
Exercisable Stock Options, Additional Disclosures
Weighted Average Remaining Contractual Term	5 years 5 months
$15.00 to $50.00
Exercisable Stock Options, Additional Disclosures
Options Vested (a) | shares	2,630	[1]
Weighted Average Exercise Price | $ / shares	$ 26.48
Aggregate Intrinsic Value | $	$ 6,700
$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, 2016 have a weighted average remaining contractual life of 5.4 years.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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-Name Accounting Standards Codification
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-SubTopic 10
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