Cash Equivalents And Restricted Cash And Securities (Summary Of Cash Equivalents And Marketable Securities) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Restricted Cash and Cash Equivalents Items [Line Items]
Unrealized Holding Loss	$ 2,000
Money Market Funds [Member] | Cash Equivalents [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Cost Basis	1,312,000	1,319,000
Unrealized Holding Loss
Estimated Market Value	1,312,000	1,319,000
Money Market Funds [Member] | Restricted Cash And Securities [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Cost Basis	321,000	323,000
Unrealized Holding Loss
Estimated Market Value	321,000	323,000
Certificates Of Deposit [Member] | Cash Equivalents [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Cost Basis	2,750,000
Unrealized Holding Loss	(2,000)
Estimated Market Value	2,748,000
Cash [Member] | Restricted Cash And Securities [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Cost Basis	5,000,000	5,000,000
Unrealized Holding Loss
Estimated Market Value	$ 5,000,000	$ 5,000,000