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Earnings Per Share (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Share repurchased (shares) |  | 4,293,924 |  |  |  |  | 4,293,924 |
Shares repurchased |  | $ 46,200 |  |  |  |  | $ 46,200 |
Shares repurchased and retired (shares) |  |  |  | 0 |  |  |  | 3,328,574
Shares repurchased and retired |  |  |  |  | $ 25 | $ 46 |  | $ 30,100
Shares repurchased pending settlement (shares) |  | 363,616 |  |  |  |  | 363,616 |
Shares repurchased pending settlement |  | $ 3,900 |  |  |  |  | $ 3,900 |
Participating securities (shares) |  | 136,324 |  | 77,157 |  |  | 123,343 | 65,264
Anti-dilutive shares (shares) |  | 1,372,601 |  | 1,730,960 |  |  | 1,461,000 | 1,644,002
Weighted average common shares outstanding for basic calculation (shares) |  | 267,106,109 |  | 267,265,705 |  |  | 267,327,888 | 267,908,427
Add: Effect of stock options, deferred stock units and restricted stock units (shares) |  | 72,854 |  | 13,850 |  |  | 113,506 | 12,463
Weighted average common shares outstanding for diluted calculation (shares) |  | 267,178,963 |  | 267,279,555 |  |  | 267,441,394 | 267,920,890
Participating securities (shares) |  | 136,324 |  | 77,157 |  |  | 123,343 | 65,264
Anti-dilutive shares (shares) |  | 1,372,601 |  | 1,730,960 |  |  | 1,461,000 | 1,644,002
Common Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Share repurchased (shares) | [1] | 4,293,924 |  |  |  |  |  |
Shares repurchased | [1] | $ 43 |  |  |  |  |  |
Shares repurchased and retired (shares) |  |  | 294,250 |  |  |  |  |
Shares repurchased and retired |  |  | $ 3 |  |  |  |  |
[1] | *In the third quarter 2021, stock repurchases of 363,616 shares totaling $3.9 million were pending settlement as of September 30, 2021. This is included in "Accounts payable" on the Condensed Consolidated Balance Sheet. See Note 11 "Earnings per Share" for details.

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