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Repurchases of Common Stock (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Schedule of Common Stock Repurchases | The following is a summary of our open market common stock repurchases and shares acquired through employee surrender for the years ended December 31, 2018, 2017 and 2016 (in thousands, except per share amounts):
﻿ |  | For the Years Ended December 31,
﻿ |  | 2018 |  | 2017 |  | 2016
﻿ |  |  |  |  |  |  |  |  |
Shares repurchased in the open market |  | 1,773 |  |  | 1,749 |  |  | 3,071 |
Shares acquired through employee surrender for statutory tax withholding |  | 52 |  |  | 57 |  |  | 60 |
Total shares repurchased |  | 1,825 |  |  | 1,806 |  |  | 3,131 |
﻿ |  |  |  |  |  |
Cost of share repurchased in the open market |  | $ | 368,691 |  |  | $ | 270,297 |  |  | $ | 313,072 |
Cost of shares for employee surrenders |  | 9,375 |  |  | 8,074 |  |  | 4,372 |
Total cost of shares |  | $ | 378,066 |  |  | $ | 278,371 |  |  | $ | 317,444 |
﻿ |  |  |  |  |  |
Average cost per share - open market repurchases |  | $ | 207.92 |  |  | $ | 154.51 |  |  | $ | 101.96 |
Average cost per share - employee surrenders |  | $ | 182.18 |  |  | $ | 142.55 |  |  | $ | 73.04 |
Average cost per share - total |  | $ | 207.19 |  |  | $ | 154.13 |  |  | $ | 101.40 |

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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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