Marketable Securities (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Equity securities	$ 0		$ 0		$ 0
Fixed income securities	3,500,000		3,500,000		$ 1,000,000
Payments to acquire marketable securities			2,600,000
Gross proceeds from sales of marketable securities				$ 6,745,000
Unrealized gains on the investments	(7,000)	$ (219,000)	(1,000)	434,000
Realized losses from the sale of marketable securities	$ (2,000)	$ 108,000	$ (9,000)	$ (444,000)
Marketable cecurities, effective maturity period			1 year 2 months 27 days
Marketable securities, average effective duration			2 months 19 days