| 
           Cash Equivalents And Investments (Narrative) (Details) (USD $) 
        In Thousands, unless otherwise specified  | 
        12 Months Ended | |
|---|---|---|
| 
           Dec. 31, 2014 
         | 
        
           Dec. 31, 2013 
         | 
      |
| Cash Equivalents And Investments [Abstract] | ||
| Gross realized gains (losses) | $ 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet | $ 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet | 
| X | ||||||||||
| 
             
- Definition 
          This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  | 
        
| X | ||||||||||
| 
             
- Details 
          
  |