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Share Repurchase Program and Treasury Stock (Details) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Share Repurchase Program and Treasury Stock (Textuals) [Abstract] |  |  |
Remaining Amount to Repurchase under the program | $ 227,200 |  |
Treasury Stock Acquired, Repurchase Authorization | 2000000000 |  |
Shares Purchased Under Share Repurchase Program | 27,300,000 |  |
Treasury Stock, Value, Acquired, Cost Method | $ 356,249 | $ 335,000 | $ 399,997
Number of shares repurchased | (598,539) | (647,756) |
Average price of share repurchased, per share | $ 595.18 | $ 517.15 |
Exercise of stock options and restricted stock units, shares reissued | 102,174 | 206,646 |

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- Definition Number of treasury shares reissued during the period as a result of the exercise of stock options and vesting of restricted stock units. + References No definition available. + Details
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- Definition Share Repurchase Program and Treasury Stock. + References No definition available. + Details
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- Definition Shares repurchased program-to-date by a Company's share repurchase program. + References No definition available. + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: 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 + Details
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- Definition Description of share repurchase program, including accounting treatment. + References Reference 1: 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 Reference 2: 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 + Details
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