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Investments (Narrative) (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Schedule of Investments [Line Items] |  |
Certificates of deposits | $ 5,000 | $ 5,500
Certificates of deposit interest rate, lower range | 0.85% |
Certificates of deposit interest rate, upper range | 1.10% |
Investments held to maturity | $ 11,342 | $ 14,083
Minimum |  |
Schedule of Investments [Line Items] |  |
Certificates of deposit maturity dates | 1 month |
Investments maturity dates | 2 months |
Maximum |  |
Schedule of Investments [Line Items] |  |
Certificates of deposit maturity dates | 12 months |
Investments maturity dates | 10 months |

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