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Stock Plans - RSAs, RSUs, PSAs and PSUs FV Assumptions (Details) - RSAs, RSUs, PSAs and PSUs	12 Months Ended
	Dec. 31, 2018 $ / shares
Assumptions
Weighted average fair value (in dollars per share)	$ 15.58
Dividend yield (as a percent)	0.00%
Expected volatility factor (as a percent)	49.00%
Risk-free interest rate (as a percent)	2.88%
Expected life (in years)	3 years

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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-Publisher FASB
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-Topic 718
-SubTopic 10
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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

Weighted average expected volatility rate of share-based compensation awards.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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