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Earnings Per Share (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Stock repurchase plan, authorized amount | $ 700,000,000 |  | $ 700,000,000 |
Aggregate shares repurchased under stock repurchase plan (in shares) |  |  | 21,658,035 |
Stock purchase value |  |  | $ 562,064,000 |
Stock Repurchased During Period, Shares |  |  | 665,095 |
Stock Repurchased During Period, Value |  |  | $ 35,542,000 | $ 11,000
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 | 931,524 | 575,541 | 887,508 | 506,437
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 | 36,589 | 71,243 | 43,292 | 68,897

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