Details Of Certain Balance Sheet Accounts (Schedule Of Other Current Assets) (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Details Of Certain Balance Sheet Accounts [Abstract]
Payroll tax escrow	$ 5,000,000	$ 5,900,000
Medicare withholds	5,800,000
Income tax receivable	8,400,000	11,700,000
Due from joint ventures	1,400,000	2,000,000
Other	4,000,000	2,700,000
Other current assets, Total	$ 24,630,000	$ 22,259,000