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Investments (Narrative) (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2016 | Dec. 31, 2015
Schedule of Investments [Line Items] |  |
Certificates of deposits | $ 10,100 | $ 12,000
Certificates of deposit interest rate, lower range | 0.45% |
Certificates of deposit interest rate, upper range | 0.90% |
Investments held to maturity | $ 22,303 | $ 17,483
Minimum [Member] |  |
Schedule of Investments [Line Items] |  |
Certificates of deposit maturity dates | 1 month |
Investments maturity dates | 1 month |
Maximum [Member] |  |
Schedule of Investments [Line Items] |  |
Certificates of deposit maturity dates | 13 months |
Investments maturity dates | 12 months |

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