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

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

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Gross number of share options (or share units) granted during the period.

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No definition available.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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Value of shares issued during the period to an employee benefit plan, such as a defined contribution or defined benefit plan.

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Stock Plans - Option Exercise Ranges and FV Assumptions (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Options Outstanding
Options Outstanding, Shares	1,394,000
Weighted Average Remaining Contractual Life	3 years 10 months 24 days
Weighted-Average Exercise Price (in dollars per share)	$ 34.97
Options Exercisable
Options Exercisable, Shares	1,389,000
Weighted Average Remaining Contractual life	3 years 10 months 24 days
Weighted Average Exercise Price (in dollars per share)	$ 34.99
$20.00 - $30.00
Information about stock options outstanding
Exercise price, low end of range (in dollars per share)	20.00
Exercise price, high end of range (in dollars per share)	$ 30.00
Options Outstanding
Options Outstanding, Shares	25,000
Weighted Average Remaining Contractual Life	5 years
Weighted-Average Exercise Price (in dollars per share)	$ 28.13
Options Exercisable
Options Exercisable, Shares	23,000
Weighted Average Remaining Contractual life	5 years
Weighted Average Exercise Price (in dollars per share)	$ 28.03
$30.01 - $40.00
Information about stock options outstanding
Exercise price, low end of range (in dollars per share)	30.01
Exercise price, high end of range (in dollars per share)	$ 40.00
Options Outstanding
Options Outstanding, Shares	1,197,000
Weighted Average Remaining Contractual Life	4 years
Weighted-Average Exercise Price (in dollars per share)	$ 32.84
Options Exercisable
Options Exercisable, Shares	1,194,000
Weighted Average Remaining Contractual life	4 years
Weighted Average Exercise Price (in dollars per share)	$ 32.84
$40.01 - $50.00
Information about stock options outstanding
Exercise price, low end of range (in dollars per share)	40.01
Exercise price, high end of range (in dollars per share)	$ 50.00
Options Outstanding
Options Outstanding, Shares	39,000
Weighted Average Remaining Contractual Life	1 year 3 months 18 days
Weighted-Average Exercise Price (in dollars per share)	$ 48.05
Options Exercisable
Options Exercisable, Shares	39,000
Weighted Average Remaining Contractual life	1 year 3 months 18 days
Weighted Average Exercise Price (in dollars per share)	$ 48.05
$50.01 - $60.00
Information about stock options outstanding
Exercise price, low end of range (in dollars per share)	50.01
Exercise price, high end of range (in dollars per share)	$ 60.00
Options Outstanding
Options Outstanding, Shares	133,000
Weighted Average Remaining Contractual Life	3 years 3 months 18 days
Weighted-Average Exercise Price (in dollars per share)	$ 51.70
Options Exercisable
Options Exercisable, Shares	133,000
Weighted Average Remaining Contractual life	3 years 3 months 18 days
Weighted Average Exercise Price (in dollars per share)	$ 51.70
2016 Employee Stock Purchase Plan
Assumptions based on which fair value of each option granted was estimated using the Black-Scholes option-pricing model
Proceeds from issue of shares under ESPP Plan	$ 2.6	$ 1.2
Number of shares issued under ESPP Plan	163,000	83,000
Weighted average fair value (in dollars per share)	$ 7.09	$ 4.45
Dividend yield (as a percent)	0.00%	0.00%
Expected volatility factor (as a percent)	36.00%	43.00%
Risk-free interest rate (as a percent)	0.99%	0.35%
Expected life (in years)	6 months	6 months
Stock option Awards
Options Exercisable
Granted (in shares)	0	0	17,000
Assumptions based on which fair value of each option granted was estimated using the Black-Scholes option-pricing model
Weighted average fair value (in dollars per share)			$ 10.58
Dividend yield (as a percent)			0.00%
Expected volatility factor (as a percent)			44.00%
Risk-free interest rate (as a percent)			1.18%
Expected life (in years)			3 years 10 months 24 days