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Repurchases Of Common Stock (Tables) | 9 Months Ended
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Sep. 30, 2017
Repurchases Of Common Stock [Abstract] |
Schedule Of Common Stock Repurchases |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | For the Three Months Ended |  | For the Nine Months Ended |
﻿ |  | September 30, |  | September 30, |
﻿ |  | 2017 |  | 2016 |  | 2017 |  | 2016 |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Shares repurchased in the open market |  |  | 312 |  |  | 142 |  |  | 1,398 |  |  | 1,119 |
﻿Shares acquired through employee surrender for statutory tax withholding |  |  | 2 |  |  | 2 |  |  | 55 |  |  | 56 |
﻿Total shares repurchased |  |  | 314 |  |  | 144 |  |  | 1,453 |  |  | 1,175 |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Cost of shares repurchased in the open market |  | $ | 50,413 |  | $ | 15,260 |  | $ | 215,320 |  | $ | 88,235 |
﻿Cost of shares for employee surrenders |  |  | 370 |  |  | 218 |  |  | 7,829 |  |  | 3,950 |
﻿Total cost of shares |  | $ | 50,783 |  | $ | 15,478 |  | $ | 223,149 |  | $ | 92,185 |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Average cost per share - open market repurchase |  | $ | 161.57 |  | $ | 107.38 |  | $ | 153.99 |  | $ | 78.84 |
﻿Average cost per share - employee surrenders |  | $ | 155.14 |  | $ | 112.91 |  | $ | 142.15 |  | $ | 70.33 |
﻿Average cost per share - total |  | $ | 161.52 |  | $ | 107.46 |  | $ | 153.54 |  | $ | 78.43 |
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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://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 4: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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