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Share Repurchases	9 Months Ended
	Sep. 30, 2021
Stockholders' Equity Note [Abstract]
Share repurchases	18. Share Repurchases In November 2020, the Company's Board of Directors approved a new standing share repurchase authorization, whereby the Company may repurchase up to 20 million shares beginning on January 1, 2021 through December 31, 2023. This share repurchase authorization replaced the February 2018 share repurchase authorization. In the nine months ended September 30, 2021, the Company repurchased 182,951 shares of common stock at a total cost of $21,637, or $118.27 per share. There were no repurchases during the three months ended September 30, 2021. In the nine months ended September 30, 2020, the Company repurchased 548,659 shares of common stock at a total cost of $52,916, or $96.45 per share. There were no repurchases during the three months ended September 30, 2020. As of September 30, 2021, 19,817,049 shares remain authorized for repurchase under the November 2020 share repurchase authorization.

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- Definition

The entire disclosure for treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-URI http://asc.fasb.org/subtopic&trid=2208821

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