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Stock-Based Compensation Restricted Stock Units Summary (Details) - Restricted Stock Units (RSUs) [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020
[Line Items]
Outstanding, beginning balance (in shares)		544	684
Outstanding, beginning balance, weighted average grant date fair value (in dollars per share)		$ 71.79
Granted (in shares)		203	189
Granted, weighted average grant date fair value (in dollars per share)		$ 98.94	$ 85.97
Forfeited (in shares)		(33)	(13)
Forfeited, weighted average grant date fair value (in dollars per share)		$ 73.65
Outstanding, ending balance (in shares)		520	630
Outstanding, ending balance, weighted average grant date fair value (in dollars per share)		$ 81.98
Vested and Released [Member]
[Line Items]
Released (in shares)	[1]	(194)	(230)
Released, weighted average grant date fair value (in dollars per share)		$ 73.35
Released, aggregate intrinsic value		$ 19,474	$ 2,506
Vested but Not Released [Member]
[Line Items]
Released (in shares)		(10)
Released, aggregate intrinsic value		$ 989
Long Term Performance Restricted Stock Award [Member]
[Line Items]
Granted, weighted average grant date fair value (in dollars per share)		$ 113.75	$ 94.28
[1] (1)     Shares released is presented as gross shares and does not reflect shares withheld by us for employee payroll tax obligations.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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