Aggregate intrinsic value price per share.

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- Definition

Expected Additional Shares To Be Issued Maximum

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- Definition

Performance restricted stock granted.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Percentage of Targeted Shares Vested

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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

Intrinsic value of vested award under share-based payment arrangement. Excludes share and unit options.

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- Definition

Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

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Stockholders' Equity - Restricted Stock Units and Performance Stock Units (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended			31 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020	Nov. 03, 2020	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax payments, for net share settlement of share based award	$ 7,809	$ 4,051	$ 14,127
Recorded share-based compensation expense				$ 93,800
Performance Based Restricted Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance criteria had been met (in shares)	200
Number of units outstanding (in shares)	300			300
Recorded share-based compensation expense	$ 48,300	24,100	4,800
Maximum additional shares to be issued (in shares)	200			200
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value price per share (in dollars per share)	$ 122.53			$ 122.53
Aggregate intrinsic value, RSUs vested	$ 56,000	$ 39,400	$ 36,600
Shares withheld, for net share settlement of share based award (in shares)	100
Tax payments, for net share settlement of share based award	$ 6,600
Approximate units of performance restricted stock granted (in shares)	400
Performance criteria had been met (in shares)	598	547	730
Number of units outstanding (in shares)	1,107	1,249	1,244	1,107		1,902
Unrecognized stock-based compensation expense related to non-vested stock options	$ 67,600			$ 67,600
Weighted average period over which costs are recognized	2 years 4 months 6 days
eXponential Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Approximate units of performance restricted stock granted (in shares)	300
Recorded share-based compensation expense	$ 40,800
Performance Stock Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value price per share (in dollars per share)	$ 122.53			$ 122.53
Shares withheld, for net share settlement of share based award (in shares)	16
Tax payments, for net share settlement of share based award	$ 1,200
Performance criteria had been met (in shares)	184	103	42
Number of units outstanding (in shares)	5,618	6,033	411	5,618		446
Recorded share-based compensation expense	$ 3,200
Unrecognized stock-based compensation expense related to non-vested stock options	$ 127,400			$ 127,400	$ 6,400
Weighted average period over which costs are recognized	4 years 5 months 26 days
Minimum \| Performance Based Restricted Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Targeted shares vested (as a percentage)	0.00%
Maximum \| Performance Based Restricted Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Targeted shares vested (as a percentage)	200.00%