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Shareholder's Equity (Narrative) (Details) $ in Millions | Dec. 31, 2016 USD ($)
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Shareholders' Equity [Abstract] |
Amount of outstanding common stock available to be repurchased | $ 15.0
Total remaining authorization under the repurchase program | $ 14.7

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

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

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