Performance-Based Stock Awards Issued and Outstanding (Details) - Amended and Restated 2010 Incentive Plan - Performance Stock Units $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) $ / shares shares
Performance Stock Units
Unvested, Beginning Balance | shares	152	[1]
Granted | shares	50	[1]
Performance adjustment | shares	60	[1],[2]
Vested | shares	(120)	[1]
Unvested, Ending Balance | shares	142	[1]
Expected to vest at end of period | shares	150	[1]
Weighted Average Grant Date Fair Value
Unvested, Beginning Balance | $ / shares	$ 57.95
Granted | $ / shares	111.47
Performance adjustment | $ / shares	28.80	[2]
Vested | $ / shares	28.80
Unvested, Ending Balance | $ / shares	88.99
Expected to vest at end of period | $ / shares	$ 91.13
Weighted Average Remaining Vesting Period (in years)
Unvested at end of period	1 year 25 days
Expected to vest at end of period	1 year 25 days
Aggregate Intrinsic Value
Unvested at end of period | $	$ 16,437	[3]
Expected to vest at end of period | $	$ 17,724	[3]

[1] The unvested PSUs are shown in this table at target. The number of shares vested reflects the number of shares earned and issued during the year. As of December 31, 2020, the maximum number of PSUs available to be earned was approximately 283 thousand.

[2] The amount shown represents performance adjustments for performance-based awards granted on February 28, 2017. These units vested at 200% during 2020 based on the achievement of cumulative Non-GAAP EPS and applicable relative TSR performance conditions during the performance period of fiscal years 2017 through 2019.

[3] The aggregate intrinsic value is calculated based on the fair value of $118.22 per share of the Company’s common stock on December 31, 2020 due to the fact that the performance stock units carry a $0 purchase price.