Stockholders’ Equity and Stock-Based Compensation - Stock Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Payment Arrangement [Abstract]
Aggregate purchase price	$ 134,157	$ 167,278	$ 235,512	$ 395,173
Shares repurchased (in shares)	376		743
Average price paid per share (in dollars per share)	$ 356.72		$ 316.98

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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