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Recent Accounting Pronouncements (Narrative) (Details) - ASU 2016-01 [Member] $ in Thousands | Dec. 31, 2017 USD ($)
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New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |
One-time cumulative-effect adjustment based upon adoption | $ (9)
Deferred Tax Assets [Member] |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |
One-time cumulative-effect adjustment based upon adoption | (9)
Retained Earnings [Member] |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |
One-time cumulative-effect adjustment based upon adoption | (44)
Accumulated Other Comprehensive Loss [Member] |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |
One-time cumulative-effect adjustment based upon adoption | $ 35

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