Stockholders' Equity - Assumptions Used to Value Stock OptionS (Details) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019 USD ($) $ / shares	Jun. 30, 2018 USD ($) $ / shares	Jun. 30, 2019 USD ($) $ / shares	Jun. 30, 2018 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award, expiration period (in years)			10 years
Dividend yield	0.00%	0.00%	0.00%	0.00%
Expected volatility	39.00%	42.00%
Risk-free interest rate	2.50%	2.90%
Suboptimal exercise factor	3.16	2.93
Weighted-average fair value (in dollars per share) \| $ / shares	$ 179	$ 161	$ 171	$ 142
Stock-based compensation expense	$ 103,848	$ 81,232	$ 205,048	$ 149,627
Total income tax impact on provision (in thousands)	$ 24,845	$ 16,889	$ 46,473	$ 31,580
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility			39.00%	40.00%
Risk-free interest rate			2.50%	2.61%
Suboptimal exercise factor			3.07	2.80
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility			41.00%	42.00%
Risk-free interest rate			2.74%	2.90%
Suboptimal exercise factor			3.16	2.93

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Suboptimal Exercise Factor

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- Definition

Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Amount of noncash expense for share-based payment arrangement.

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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.

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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.

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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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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

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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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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