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Stock-Based Compensation (Summary of Activity of Options Outstanding not yet Vested) (Details) - $ / shares shares in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Stock-Based Compensation [Abstract] |  |  |
Number of Shares, Unvested as of December 31, 2017 | 2,860 |  |
Number of Shares, Granted | 941 | 1,171 | 1,357
Number of Shares, Vesting during period | (1,104) |  |
Number of Shares, Forfeited/cancelled | (43) |  |
Number of Shares, Unvested as of December 31, 2018 | 2,654 | 2,860 |
Weighted-Average Fair Value Per Share, Unvested as of December 31, 2017 | $ 22.08 |  |
Weighted-Average Fair Value Per Share, Granted | 33.01 | $ 23.88 | $ 19.19
Weighted-Average Fair Value Per Share, Vesting during period | 21.74 |  |
Weighted-Average Fair Value Per Share, Forfeited/canceled | 26.32 |  |
Weighted-Average Fair Value Per Share, Unvested as of December 31, 2018 | $ 26.05 | $ 22.08 |

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- Definition Share-based compensation arrangement by share-based payment award, options, forfeited or canceled, weighted average grant date fair value. + References No definition available. + Details
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- Definition Share-based compensation arrangement by share-based payment award options, nonvested number. + References No definition available. + Details
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- Definition Share-based compensation arrangement by share-based payment award options, nonvested number vested in period. + References No definition available. + Details
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- Definition Share-based compensation arrangement by share-based payment award options nonvested, weighted average grant date fair value. + References No definition available. + Details
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- Definition Share-based compensation arrangement by share-based payment award, options, vested in period, weighted average grant date fair value + References No definition available. + Details
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- Definition Net number of share options (or share units) granted during the period. + 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)(iv)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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=96867065&loc=d3e5070-113901 + Details
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