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Investments (Narrative) (Details) (USD $) |  |  | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2014 Minimum [Member] | Sep. 30, 2014 Maximum [Member]
Schedule of Investments [Line Items] |  |  |  |
Certificates of deposits | $ 13,900,000 | $ 10,700,000 |  |
Certificates of deposit interest rate, lower range | 0.20% |  |  |
Certificates of deposit interest rate, upper range | 0.75% |  |  |
Certificates of deposit maturity dates |  |  | 1 month | 22 months
Investments held to maturity | $ 21,924,000 | $ 27,021,000 |  |
Investments maturity dates |  |  | 1 month | 22 months

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