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Shareholders' Equity (Narrative) (Details) $ in Thousands | Dec. 31, 2017 USD ($)
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Shareholders’ Equity [Abstract] |
Stock repurchase program, authorized amount | $ 2,400,000
Value of common shares remaining to be repurchased | $ 118,274

X
- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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X
- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration