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Share repurchases Share Repurchases (Tables) | 9 Months Ended
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Sep. 30, 2019
Treasury Stock, Value [Abstract] |
Class of Treasury Stock [Table Text Block] | The following table summarizes the Company's repurchases of its common stock during the three and nine months ended September 30, 2019.
| Three months ended September 30, 2019 |  | Nine months ended September 30, 2019
| Shares repurchased |  | Amount paid |  | Average amount |  | Shares repurchased |  | Amount paid |  | Average amount
Tender Offer(1) | 21,802 |  |  | $ | 1,233,886 |  |  | $ | 56.60 |  |  | 21,802 |  |  | $ | 1,233,886 |  |  | $ | 56.60 |
Open market repurchases | 8,790 |  |  | 514,082 |  |  | 58.49 |  |  | 10,850 |  |  | 626,271 |  |  | 57.72 |
| 30,592 |  |  | $ | 1,747,968 |  |  | $ | 57.14 |  |  | 32,652 |  |  | $ | 1,860,157 |  |  | $ | 56.97 |
(1) The amount paid for shares repurchased associated with the Company's Tender Offer during the three and nine months ended September 30, 2019 includes the clearing price of $56.50 per share plus related fees and expenses of $2,074.

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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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