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Earnings Per Share (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Stock repurchase plan, authorized amount | $ 900,000,000 |  | $ 900,000,000 |
Aggregate shares repurchased under stock repurchase plan (in shares) |  |  | 22,918,221 |
Stock purchase value |  |  | $ 669,285,000 |
Stock Repurchased During Period, Shares | 759,896 |  | 1,260,186 | 665,095
Stock Repurchased During Period, Value | $ 67,116,000 |  | $ 107,222,000 | $ 35,542,000
Stock Options And Service-Based Restricted Stock Units [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities excluded from computation of earnings per share, number of shares | 216,386 | 931,524 | 325,410 | 887,508
Performance-Based Restricted Stock Units [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities excluded from computation of earnings per share, number of shares | 23,971 | 36,589 | 23,971 | 43,292

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- Definition Equity impact of the value of stock that has been repurchased to date and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References No definition available. + Details
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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