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Investments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Investment in Marketable Securities (Textual) [Abstract] |  |  |  |  |
Impairment of equity securities | $ 20 | $ 31 | $ 20 | $ 1,545 |
Equity Securities [Member] |  |  |  |  |
Available-for-sale Securities |  |  |  |  |
Cost | 6,257 |  | 6,257 |  | $ 3,386
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 180 |  | 180 |  | 1,179
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 5,173 |  | 5,173 |  | 559
Available-for-sale Securities, Estimated Fair Value | 11,250 |  | 11,250 |  | $ 2,766
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 180 |  | 180 |  |
Less than twelve Months, Fair Value | 2,979 |  | 2,979 |  |
Twelve months or more, Fair Value | 0 |  | 0 |  |
Fair Value | $ 2,979 |  | $ 2,979 |  |

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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale. + 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 (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562 + Details
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