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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.

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