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Income Taxes - Changes in Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
	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