Summary of Significant Accounting Policies (Marketable Securities) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2011	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Net realized gain (loss) on available-for-sale securities	$ 0	$ (22,000)
Adjusted Cost			15,318,000
Gross Unrealized Gains			12,361,000
Gross Unrealized Losses			0
Fair Value			27,679,000
Common Stocks [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	4,195,000		4,195,000
Gross Unrealized Gains	9,778,000		12,361,000
Gross Unrealized Losses	0		0
Fair Value	13,973,000		16,556,000
Government and government sponsored entities [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost			11,123,000
Gross Unrealized Gains			0
Gross Unrealized Losses			0
Fair Value			$ 11,123,000