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Investments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Investment in Marketable Securities (Textual) [Abstract] |  |  |  |  |
Unrealized gain (loss) on available for sale securities | $ (931) | $ (1,086) | $ (3,744) | $ (1,487) |
Impairment of equity securities | (483) | $ (1,092) | (2,028) | $ (4,614) |
Marketable securities [Member] |  |  |  |  |
Available-for-sale Securities |  |  |  |  |
Cost | 3,730 |  | 3,730 |  | $ 5,687
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 1,196 |  | 1,196 |  | 8
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 679 |  | 679 |  | 303
Available-for-sale Securities, Estimated Fair Value | 3,213 |  | 3,213 |  | $ 5,982
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |  |  |  |
Less than twelve Months, Fair Value | 1,017 |  | 1,017 |  |
Twelve months or more, Fair Value | 0 |  | 0 |  |
Fair Value | 1,017 |  | 1,017 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 1,196 |  | $ 1,196 |  |

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- Definition Amount before tax of unrealized gain 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 (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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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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