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           Intangible Assets (Narrative) (Details) (USD $) 
        In Thousands, unless otherwise specified  | 
        12 Months Ended | ||
|---|---|---|---|
| 
           Dec. 31, 2014 
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           Dec. 31, 2013 
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           Dec. 31, 2012 
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| Intangible Assets [Abstract] | |||
| Amortization expense | $ 107us-gaap_AmortizationOfIntangibleAssets | $ 102us-gaap_AmortizationOfIntangibleAssets | $ 103us-gaap_AmortizationOfIntangibleAssets | 
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- Definition 
          The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Details 
          
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