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Repurchases Of Common Stock (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares
Shares of common stock repurchases authorized | 65,000,000 |  |
Remaining shares available for repurchase under authorization | 3,735,508 |  |
Share repurchases during the period | 3,071,000 | 5,659,000 | 9,761,000
Shares acquired through employee surrenders | 60,000 | 69,000 | 92,000
Total shares repurchased | 3,131,000 | 5,728,000 | 9,853,000
Cost of share repurchases during the period | $ | $ 313,072 | $ 406,430 | $ 618,158
Cost of employee surrenders | $ | 4,372 | 5,457 | 5,809
Total cost of shares repurchased | $ | $ 317,444 | $ 411,887 | $ 623,967
Average cost per share | $ / shares | $ 101.40 | $ 71.90 | $ 63.32
Stock split | 2 |  |
Treasury Stock [Member] |  |  |
Total shares repurchased |  | 4,313,000 | 4,927,000

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- Definition The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB TOPIC 4.C) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Stock Split -URI http://asc.fasb.org/extlink&oid=6525746 + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: 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 + Details
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