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Stock-Based Compensation - Weighted-Average Assumptions (Details) - PRSUs	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term	2 years 10 months 10 days	2 years 11 months 1 day	2 years 10 months 10 days
Expected volatility	39.00%	42.10%	42.70%
Risk-free interest rate	2.35%	1.51%	0.88%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Correlation range	11.00%	26.80%	24.40%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Correlation range	85.70%	76.00%	71.00%

X

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Correlation Rate

+ References

No definition available.

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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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.

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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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