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Investments (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Schedule of Investments [Line Items] |  |
Certificates of deposit | $ 6,000 | $ 2,880
Certificates of deposit interest rate, lower range | 1.00% |
Certificates of deposit interest rate, upper range | 1.60% |
Investments held to maturity | $ 8,942 | $ 6,077
Minimum |  |
Schedule of Investments [Line Items] |  |
Certificates of deposit maturity dates | 1 month |
Investments maturity dates | 1 month |
Maximum |  |
Schedule of Investments [Line Items] |  |
Certificates of deposit maturity dates | 4 months |
Investments maturity dates | 4 months |

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- Definition Upper range of interest rates for certificates of deposit. + References No definition available. + Details
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- Definition A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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