Impairment Of Investments (Narrative) (Details) (USD $)	6 Months Ended
Jun. 30, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Unrealized Losses	$ 504,000	$ 803,000
Corporate Debt [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of corporate debt securities with unrealized losses	2
Debt securities face amount	2,000,000
Available-for-sale Securities, Gross Unrealized Losses	444,000	569,000
Improvemnt of unrealized loss position	$ 125,000
Description of interest rate	LIBOR plus 55 basis points
Interest rate	0.55%
Maturity	10 years

Amount of debt securities categorized neither as held-to-maturity nor trading.

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