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Stockholders' Equity Stockholders' Equity (Outstanding stock options) (Details) shares in Thousands | 12 Months Ended
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Dec. 31, 2017 $ / shares shares
Range Of Exercise Prices, $4.78-5.94 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise price range, lower range limit (in usd per share) | $ 4.78
Exercise price range, upper range limit (in usd per share) | $ 5.94
Number of outstanding options at end of year (in shares) | shares | 105,603
Weighted-average remaining contractual life, options outstanding | 3 years 6 months
Weighted average exercise price, options outstanding (in usd per share) | $ 5.66
Number of exercisable options at end of year (in shares) | shares | 105,603
Weighted average exercise price, options exercisable (in usd per share) | $ 5.66
Range Of Exercise Prices, $16.73-17.21 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise price range, lower range limit (in usd per share) | 16.73
Exercise price range, upper range limit (in usd per share) | $ 20.49
Number of outstanding options at end of year (in shares) | shares | 942,153
Weighted-average remaining contractual life, options outstanding | 3 years 11 months 1 day
Weighted average exercise price, options outstanding (in usd per share) | $ 19.02
Number of exercisable options at end of year (in shares) | shares | 797,673
Weighted average exercise price, options exercisable (in usd per share) | $ 18.83
Range of Exercise Prices, $18.86-20.49 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise price range, lower range limit (in usd per share) | 22.58
Exercise price range, upper range limit (in usd per share) | $ 26.93
Number of outstanding options at end of year (in shares) | shares | 885,900
Weighted-average remaining contractual life, options outstanding | 6 years 8 months 27 days
Weighted average exercise price, options outstanding (in usd per share) | $ 24.61
Number of exercisable options at end of year (in shares) | shares | 322,001
Weighted average exercise price, options exercisable (in usd per share) | $ 22.58
Range of Exercise Prices, $4.78-20.49 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise price range, lower range limit (in usd per share) | 4.78
Exercise price range, upper range limit (in usd per share) | $ 26.93
Number of outstanding options at end of year (in shares) | shares | 1,933,656
Weighted-average remaining contractual life, options outstanding | 5 years 2 months 9 days
Weighted average exercise price, options outstanding (in usd per share) | $ 20.85
Number of exercisable options at end of year (in shares) | shares | 1,225,277
Weighted average exercise price, options exercisable (in usd per share) | $ 18.68

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- Definition 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. + References No definition available. + 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=96867065&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=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + 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=96867065&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=96867065&loc=d3e5070-113901 + Details
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