Earnings Per Share (Narrative) (Details) - USD ($) |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
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| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
| Stock repurchase plan, authorized amount | $ 700,000,000 | |
| Aggregate shares repurchased under stock repurchase plan (in shares) | 21,893,532 | |
| Stock purchase value | $ 580,163,000 | |
| Stock Repurchased During Period, Shares | 235,497 | 616,152 |
| Stock Repurchased During Period, Value | $ 18,099,000 | $ 33,000,000 |
| 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 | 205,991 | 760,003 |
| 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 | 21,164 | 42,524 |
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- Definition Number of shares that have been repurchased to date under the program. No definition available.
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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. No definition available.
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Amount of stock repurchase plan authorized. No definition available.
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Equity impact of the value of stock that has been repurchased during the period 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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