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Share Repurchase Program and Treasury Stock (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Stock Repurchase Program, Additional Authorized Amount |  |  | $ 2,000,000
Share Repurchase Program and Treasury Stock (Textuals) [Abstract] |  |  |
Authorized amount under share repurchase program | $ 1,900,000 |  |
Shares Purchased Under Share Repurchase Program | 27,800,000 |  |
Repurchases of common stock | $ (186,250) | $ (118,750) |
Number of shares repurchased | (290,429) | (187,880) |
Average price of share repurchased, per share | $ 641.27 | $ 632.03 |
Exercise of stock options and restricted stock units, shares reissued | 171,752 | 39,362 |

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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 The additional amount authorized by an entity's Board of Directors under a stock repurchase program. + 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 Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 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 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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