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Marketable Securities - Additional Information (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Fair market value of investment securities exceeds cost basis | $ 247,000 |  | $ 247,000 |
Other-than-temporary impairments recorded for securities | 0 |  | 0 |
Changes in unrealized gains on available for sale securities, taxes | (1,000) | (409,000) | 11,000 | (452,000)
Estimated taxes of change in value of available-for-sale securities |  |  | 4,000 |
Gross unrealized holding gains |  |  | 299,000 |
Gross unrealized holding losses |  |  | $ 52,000 |

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- Definition Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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