Investment Income (Loss) (Details) (USD $)	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Jun. 30, 2012	Sep. 30, 2012	Sep. 30, 2011
Investment Income (Loss) [Abstract]
Interest and dividend income	$ 323,000	$ 87,000		$ 3,159,000	$ 2,971,000
Investment gain	0	0		9,780,000	1,071,000
Equity earnings (loss)	0	(753,000)		(522,000)	(1,418,000)
Total investment income	323,000	(666,000)		12,417,000	2,624,000
Gain associated in connection with previously written-off investment			$ 9,800,000