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Employee Benefits and Share-Based Compensation - Summary of Restricted Stock Unit Activity (Details) - RSUs - 2009 Plan - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Number of Shares
Outstanding at beginning of period (in shares)	580
Granted (Awarded) (in shares)	96
Vested (Released) (in shares)	(37)
Forfeited (in shares)	(17)
Outstanding and unvested at end of period (in shares)	622	580
Weighted-Average Grant Date Fair Value
Outstanding and unvested (in dollars per share)	$ 72.87
Granted (Awarded) (in dollars per share)	129.97
Vested (Released) (in dollars per share)	72.71
Forfeited (in dollars per share)	70.59
Outstanding and unvested (in dollars per share)	$ 81.79	$ 72.87
Weighted-Average Remaining Years
Outstanding and unvested	1 year 7 months 6 days	1 year 7 months 6 days
Aggregate Intrinsic Value
Outstanding and unvested	$ 80,723	$ 69,670

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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

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