Accounts Payable And Accrued Expenses (Schedule Of Accounts Payable And Accrued Expenses) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Accounts Payable And Accrued Expenses [Abstract]
Trade accounts payable	$ 45,800,000	$ 47,906,000
Accrued salaries and wages	50,169,000	47,290,000
Accrued workers' compensation and auto liability	8,092,000	7,657,000
Accrued litigation	11,331,000	19,245,000
Accrued employee medical insurance	10,353,000	10,605,000
Accrued property taxes	23,416,000	22,626,000
Accrued interest	14,270,000	14,237,000
Other	33,236,000	34,230,000
Accounts payable and accrued expenses, total	196,667,000	203,796,000
Workers' compensation and auto liability	22,300,000	23,300,000
Workers' compensation discount rate	3.00%	3.00%
Workers compensation and auto liability, undiscounted basis	$ 25,000,000	$ 26,000,000