Investment in Securities, Part II (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014 InvestmentHoldinginLossPosition	Sep. 30, 2013 InvestmentHoldinginLossPosition	Sep. 30, 2014 InvestmentHoldinginLossPosition	Sep. 30, 2013 InvestmentHoldinginLossPosition	Dec. 31, 2013 InvestmentHoldinginLossPosition	Dec. 31, 2012
Available for Sale Securities, Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value [Abstract]
Cost	$ 38,650,000	$ 43,096,000	$ 38,650,000	$ 43,096,000	$ 39,283,000
Gross unrealized gains	38,640,000	38,611,000	38,640,000	38,611,000	49,636,000
Gross unrealized losses	(2,000)	(159,000)	(2,000)	(159,000)	(154,000)
Total available for sale securities	77,288,000	81,548,000	77,288,000	81,548,000	88,765,000
Unrealized changes to fair value net of taxes included in other comprehensive income	(2,407,000)	(2,170,000)	(6,832,000)	(3,030,000)
Return of capital on available for sale securities	266,000	469,000	827,000	1,094,000
Proceeds from sale of investment available for sale	1,500,000	10,444,000	8,018,000	32,422,000
Gross realized gains on sale of investment available for sale	300,000	5,700,000	3,500,000	16,200,000
Investments classified as available for sale unrealized loss position [Abstract]
Cost	79,000	1,306,000	79,000	1,306,000	1,215,000
Unrealized Losses			(2,000)	(159,000)	(154,000)
Fair Value	77,000	1,147,000	77,000	1,147,000	1,061,000
Number of investment holding in loss positions	1	4	1	4	4
Investment holding impairment period (in months)	1 month	4 months				7 months
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities	0	0	69,000	14,000
Common Stock [Member]
Available for Sale Securities, Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value [Abstract]
Cost	14,228,000	16,372,000	14,228,000	16,372,000	13,389,000
Gross unrealized gains	22,152,000	19,925,000	22,152,000	19,925,000	29,657,000
Gross unrealized losses	0	0	0	0	0
Total available for sale securities	36,380,000	36,297,000	36,380,000	36,297,000	43,046,000
Closed-end Funds [Member]
Available for Sale Securities, Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value [Abstract]
Cost	21,819,000	23,850,000	21,819,000	23,850,000	23,100,000
Gross unrealized gains	14,325,000	16,545,000	14,325,000	16,545,000	17,654,000
Gross unrealized losses	(2,000)	(123,000)	(2,000)	(123,000)	(130,000)
Total available for sale securities	36,142,000	40,272,000	36,142,000	40,272,000	40,624,000
Investments classified as available for sale unrealized loss position [Abstract]
Cost	79,000	941,000	79,000	941,000	912,000
Unrealized Losses			(2,000)	(123,000)	(130,000)
Fair Value	77,000	818,000	77,000	818,000	782,000
Mutual Funds [Member]
Available for Sale Securities, Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value [Abstract]
Cost	2,603,000	2,874,000	2,603,000	2,874,000	2,794,000
Gross unrealized gains	2,163,000	2,141,000	2,163,000	2,141,000	2,325,000
Gross unrealized losses	0	(36,000)	0	(36,000)	(24,000)
Total available for sale securities	4,766,000	4,979,000	4,766,000	4,979,000	5,095,000
Investments classified as available for sale unrealized loss position [Abstract]
Cost	0	365,000	0	365,000	303,000
Unrealized Losses			0	(36,000)	(24,000)
Fair Value	$ 0	$ 329,000	$ 0	$ 329,000	$ 279,000