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Repurchases Of Common Stock (Tables) | 9 Months Ended
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Sep. 30, 2018
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 for the three and nine months ended September 30, 2018 and 2017 (in thousands, except per share amounts):
﻿ | For the Three Months Ended September 30, |  | For the Nine Months Ended September 30,
﻿ | 2018 |  | 2017 |  | 2018 |  | 2017
﻿ |  |  |  |  |  |  |  |  |
Shares repurchased in the open market | 302 |  |  | 312 |  |  | 1,284 |  |  | 1,398 |
Shares acquired through employee surrender for statutory tax withholding | 1 |  |  | 2 |  |  | 50 |  |  | 55 |
Total shares repurchased | 303 |  |  | 314 |  |  | 1,334 |  |  | 1,453 |
﻿ |  |  |  |  |  |  |
Cost of shares repurchased in the open market | $ | 73,247 |  |  | $ | 50,413 |  |  | $ | 265,209 |  |  | $ | 215,320 |
Cost of shares for employee surrenders | 390 |  |  | 370 |  |  | 9,110 |  |  | 7,829 |
Total cost of shares | $ | 73,637 |  |  | $ | 50,783 |  |  | $ | 274,319 |  |  | $ | 223,149 |
﻿ |  |  |  |  |  |  |
Average cost per share - open market repurchases | $ | 242.78 |  |  | $ | 161.57 |  |  | $ | 206.59 |  |  | $ | 153.99 |
Average cost per share - employee surrenders | $ | 253.34 |  |  | $ | 155.14 |  |  | $ | 181.68 |  |  | $ | 142.15 |
Average cost per share - total | $ | 242.83 |  |  | $ | 161.52 |  |  | $ | 205.65 |  |  | $ | 153.54 |

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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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