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Repurchases Of Common Stock (Tables) | 6 Months Ended
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Jun. 30, 2016
Repurchases Of Common Stock [Abstract] |
Schedule Of Common Stock Repurchases |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | For the Three Months Ended |  | For the Six Months Ended
﻿ |  | June 30, |  | June 30,
﻿ |  | 2016 |  | 2015 |  | 2016 |  | 2015
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿Shares repurchased 1 |  |  | 269 |  |  | 1,415 |  |  | 977 |  |  | 3,133
﻿Shares acquired through employee surrender 1 |  |  | 2 |  |  | 2 |  |  | 54 |  |  | 64
﻿Total shares repurchased 1 |  |  | 271 |  |  | 1,417 |  |  | 1,031 |  |  | 3,197
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿Cost of shares repurchased |  | $ | 23,260 |  | $ | 93,461 |  | $ | 72,975 |  | $ | 227,108
﻿Cost of employee surrenders |  |  | 203 |  |  | 195 |  |  | 3,732 |  |  | 5,061
﻿Total cost of shares repurchased |  | $ | 23,463 |  | $ | 93,656 |  | $ | 76,707 |  | $ | 232,169
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿Average cost per share |  | $ | 86.46 |  | $ | 66.07 |  | $ | 74.38 |  | $ | 72.63
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| (1) |  | Shares repurchased and acquired through employee surrender for payment of minimum required withholding taxes on and before June 15, 2015 and the associated average cost per share have been adjusted to reflect the June 15, 2015 two-for-one stock split. Actual shares repurchased were approximately 890,000 for the three months ended June 30, 2015 and 1,749,000 for the six months ended June 30, 2015.

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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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