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Income Taxes - Income Taxes Changes (Details) (USD $)	3 Months Ended		9 Months Ended
Income Taxes - Income Taxes Changes (Details) (USD $)	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