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Repurchases of Common Stock (Tables) | 6 Months Ended
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Jun. 30, 2021
Equity [Abstract] |
Schedule of common stock repurchases | The following is a summary of our open market common stock repurchases, reported on a trade date basis, and shares acquired through employee surrender:
(in thousands, except per share amounts) | For the Three Months Ended June 30, |  | For the Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Shares repurchased in the open market | 341 |  |  | — |  |  | 618 |  |  | 721 |
Shares acquired through employee surrender for statutory tax withholding (1) | — |  |  | — |  |  | 28 |  |  | 30 |
Total shares repurchased | 341 |  |  | — |  |  | 646 |  |  | 751 |
Cost of shares repurchased in the open market | $ | 188,409 |  |  | $ | — |  |  | $ | 327,622 |  |  | $ | 179,623 |
Cost of shares for employee surrenders | 3 |  |  | 65 |  |  | 14,986 |  |  | 8,669 |
Total cost of shares | $ | 188,412 |  |  | $ | 65 |  |  | $ | 342,608 |  |  | $ | 188,292 |
Average cost per share - open market repurchases | $ | 552.08 |  |  | $ | — |  |  | $ | 529.45 |  |  | $ | 249.20 |
Average cost per share - employee surrenders | $ | 550.59 |  |  | $ | 312.19 |  |  | $ | 544.08 |  |  | $ | 288.94 |
Average cost per share - total | $ | 552.08 |  |  | $ | 312.19 |  |  | $ | 530.07 |  |  | $ | 250.79 |
(1) For the quarters ended June 30, 2021 and 2020, the number of shares acquired though employee surrender for statutory tax withholding were below rounding thresholds.

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- Definition Tabular disclosure of 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23309-112656 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 + Details
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