Current Liabilities (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Accounts Payable And Accrued Liabilities Current And Noncurrent [Abstract]
Accounts payable and accrued liabilities	$ 1,840,465,000	$ 1,828,755,000
Longterm Notes And Loans By Type Current And Noncurrent [Abstract]
Notes payable & current portion of long-term obligations	550,000,000	50,000,000
Line of Credit Facility, Commitment Fee Amount	$ 1,000,000	$ 2,000,000	$ 1,000,000