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Share repurchases Share Repurchases (Tables) | 9 Months Ended
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Sep. 30, 2021
Treasury Stock, Value [Abstract] |
Class of Treasury Stock [Table Text Block] | The following table summarizes the Company's common stock repurchases during the three and nine months ended September 30, 2021 and 2020:
| Three months ended September 30, |  | Nine months ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Open market repurchases: |  |  |  |  |  |  |
Shares | 2,731 |  |  | 250 |  |  | 7,750 |  |  | 4,302 |
Amount paid | $ | 336,217 |  |  | $ | 21,259 |  |  | $ | 899,447 |  |  | $ | 324,398 |
Average paid per share | $ | 123.14 |  |  | $ | 85.04 |  |  | $ | 116.06 |  |  | $ | 75.40 |
Tender offer: |  |  |  |  |  |  |
Shares | — |  |  | 7,982 |  |  | — |  |  | 7,982 |
Amount paid(1) | $ | — |  |  | $ | 704,180 |  |  | $ | — |  |  | $ | 704,180 |
Average paid per share | $ | — |  |  | $ | 88.22 |  |  | $ | — |  |  | $ | 88.22 |
Total: |  |  |  |  |  |  |
Shares | 2,731 |  |  | 8,232 |  |  | 7,750 |  |  | 12,284 |
Amount paid | $ | 336,217 |  |  | $ | 725,439 |  |  | $ | 899,447 |  |  | $ | 1,028,578 |
Average paid per share | $ | 123.14 |  |  | $ | 88.13 |  |  | $ | 116.06 |  |  | $ | 83.73 |
(1)Represents the aggregate amount paid for shares repurchased pursuant to the Company's 2020 tender offer for its shares during the three and nine months ended September 30, 2020, including its clearing price of $88.00 per share plus related fees and expenses of $1,792.

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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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