Shareholders' Equity (Narrative) (Details) - USD ($) |
1 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
Feb. 10, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
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| Class of Stock [Line Items] | ||||
| Stock repurchase plan, authorized amount | $ 700,000,000 | |||
| Aggregate shares repurchased under stock repurchase plan | 20,992,940 | |||
| Stock repurchased to date, value | $ 526,522,000 | |||
| Stock Repurchased During Period, Value | $ 11,000 | $ 70,068,000 | $ 15,000,000 | |
| Share Repurchase Program [Domain] | ||||
| Class of Stock [Line Items] | ||||
| Aggregate shares repurchased under stock repurchase plan | 616,152 | |||
| Stock Repurchased During Period, Value | $ 33,000,000 | |||
| X | ||||||||||
- 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 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 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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- Details
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