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Income Taxes - Changes in Income Taxes (Details) (USD $) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Income Tax Disclosure [Abstract] |  |  |  |
Income tax expense | $ 193,000 | $ 113,000 | $ 24,000 | $ 4,000
Deferred tax benefit on unrealized losses on marketable equity securities in other comprehensive income | $ 449,000 | $ 1,011,000 | $ 975,000 | $ 1,540,000

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