Fair Value Of Financial Instruments (Schedule Of Equity Interest) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Schedule of Investments [Line Items]
Fair Value	$ 196,500
Cost	196,500
Investment income interest	(16)	(14)
Mortgage Loans [Member]
Schedule of Investments [Line Items]
Fair Value	100,000
Cost	100,000
Acquisition Loan [Member]
Schedule of Investments [Line Items]
Fair Value	93,200
Cost	93,200
Equity Investments [Member]
Schedule of Investments [Line Items]
Fair Value	3,300
Cost	3,300
Ernest Health Holdings, LLC [Member]
Schedule of Investments [Line Items]
Investment income interest	$ 2,000