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Shareholders' Equity Textuals (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jan. 30, 2017
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |
Common Stock, Shares Authorized | 125,000,000 | 125,000,000 |  |
Common Stock, Par or Stated Value Per Share | $ 0.01 | $ 0.01 |  | $ 0.01
Common Stock, Voting Rights | one |  |  |
Common Stock Reserved for Issuance to the Stock Option Plans | 3,706,789 |  |  |
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |
Preferred Stock, Shares Authorized | 10,000,000 | 10,000,000 |  |
Preferred Stock, Par Value | $ 0.01 | $ 0.01 |  |
Share Repurchase Program and Treasury Stock [Abstract] |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 1,000,000 |  |  |
Shares Repurchased Under Share Repurchase Program | 26,000,000 |  |  |
Share Repurchase Program, Total Cost Program to Date | $ 3,500,000 |  |  |
Repurchases of Common Stock, Value | $ (499,992) | $ (494,966) | $ (414,000) |
Repurchases of Common Stock, Shares | (1,348,507) | (1,556,797) |  |
Treasury Stock Acquired, Average Cost Per Share | $ 370.75 | $ 317.92 |  |
Exercise of stock options and restricted stock units, shares | 278,623 | 403,908 |  |

X
- 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 Total cost spent on the share repurchase program to date by the Company. + 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 number of shares reserved for grant under the Company's Stock Option Plan. The amount represents the total shares available for grant plus the total shares outstanding. + References No definition available. + Details
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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Description of voting rights of common stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 + Details
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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