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Recent Accounting Pronouncements (Narrative) (Details) - ASU 2016-01 [Member] $ in Thousands	Dec. 31, 2017 USD ($)
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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- Definition

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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.

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