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Note 12. Stock-Based Compensation Summary of Exercisable Stock Options (Details) - Options $ / shares in Units, $ in Thousands, shares in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares
$15.00 to $50.00
Exercisable Stock Options, Additional Disclosures
Options Vested | shares	2.6
Weighted Average Exercise Price | $ / shares	$ 28.82
Aggregate Intrinsic Value | $	$ 0
Weighted Average Remaining Contractual Life	4 years 1 month
$50.01 and above
Exercisable Stock Options, Additional Disclosures
Options Vested | shares	0.1
Weighted Average Exercise Price | $ / shares	$ 137.50
Aggregate Intrinsic Value | $	$ 0
Weighted Average Remaining Contractual Life	1 year 11 months

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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.

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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.

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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.

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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.

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