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Income Taxes - Income Taxes Changes (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Income Tax Disclosure [Abstract] |  |  |  |
Income tax benefit | $ 47,000 | $ 436,000 | $ 23,000 | $ 432,000
Deferred tax (expense) benefit on unrealized losses on marketable equity securities in other comprehensive income | $ (47,000) | $ (576,000) | $ 928,000 | $ 964,000

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