Investments (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Investments
Fair value of investments	$ 19,253,000		$ 19,253,000		$ 18,310,000
Investments (realized and unrealized gains/(losses))	163,000	2,857,000	156,000	2,539,000
Investment in FATV
Investments
Fair value of investments	16,015,000		16,015,000		15,863,000
Total partnership capital	63,300,000		63,300,000		63,700,000
Share in management fee income	200,000	200,000	500,000	500,000
Employee Investment Funds, net of Company's ownership interest
Investments
Fair value of investments	1,238,000		1,238,000		1,247,000
Other investment
Investments
Fair value of investments	$ 2,000,000		$ 2,000,000		$ 1,200,000