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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

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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. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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 (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + 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 (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + 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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