Investments (Schedule of Amortized Cost, Unrealized Gains And Losses, And Market Value of Investment Securities) (Details) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Cash & Cash Equivalents	$ 433,486,636	$ 309,591,724
Cost	85,290,342	77,055,612
Unrealized Gains	19,197,991	29,998,513
Unrealized Losses	(379,568)	(48,603)
Investments	104,108,765	107,005,522
Investments and Cash	537,595,401	416,597,246
Short-term Investments [Member] | Other Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	79
Unrealized Gains	0
Unrealized Losses	0
Investments	79
Long-Term Investments [Member] | Common Stocks
Schedule of Available-for-sale Securities [Line Items]
Cost	16,211,829	22,799,035
Unrealized Gains	7,679,257	10,532,007
Unrealized Losses	(371,443)	(48,603)
Investments	23,519,643	33,282,439
Long-Term Investments [Member] | Mutual Funds – Equity
Schedule of Available-for-sale Securities [Line Items]
Cost	69,078,434	54,256,577
Unrealized Gains	11,518,734	19,466,506
Unrealized Losses	(8,125)	0
Investments	80,589,043	73,723,083
Fair Value, Inputs, Level 1 [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash & Cash Equivalents	433,486,636	309,591,724
Investments and Cash	537,595,401	416,597,246
Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member] | Other Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments	79
Fair Value, Inputs, Level 1 [Member] | Long-Term Investments [Member] | Common Stocks
Schedule of Available-for-sale Securities [Line Items]
Investments	23,519,643	33,282,439
Fair Value, Inputs, Level 1 [Member] | Long-Term Investments [Member] | Mutual Funds – Equity
Schedule of Available-for-sale Securities [Line Items]
Investments	80,589,043	73,723,083
Fair Value, Inputs, Level 2 [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash & Cash Equivalents	0	0
Investments and Cash	0	0
Fair Value, Inputs, Level 2 [Member] | Short-term Investments [Member] | Other Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments	0
Fair Value, Inputs, Level 2 [Member] | Long-Term Investments [Member] | Common Stocks
Schedule of Available-for-sale Securities [Line Items]
Investments	0	0
Fair Value, Inputs, Level 2 [Member] | Long-Term Investments [Member] | Mutual Funds – Equity
Schedule of Available-for-sale Securities [Line Items]
Investments	0	0
Fair Value, Inputs, Level 3 [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash & Cash Equivalents	0	0
Investments and Cash	0	0
Fair Value, Inputs, Level 3 [Member] | Short-term Investments [Member] | Other Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments	0
Fair Value, Inputs, Level 3 [Member] | Long-Term Investments [Member] | Common Stocks
Schedule of Available-for-sale Securities [Line Items]
Investments	0	0
Fair Value, Inputs, Level 3 [Member] | Long-Term Investments [Member] | Mutual Funds – Equity
Schedule of Available-for-sale Securities [Line Items]
Investments	$ 0	$ 0