Accounts Payable And Accrued Expenses (Components Of Accounts Payable And Accrued Expenses) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Accounts Payable And Accrued Expenses [Abstract]
Accounts payable	$ 768,886	$ 782,185
Payroll and benefits	166,098	131,177
Health insurance, workers' compensation and other insurance costs	70,844	74,934
Current derivative liability	42,136	60,326
Other accrued liabilities	184,201	184,254
Total	$ 1,232,165	$ 1,232,876