Long Term Liabilities (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Long Term Obligations [Abstract]
Notes Payable to Bank	$ 373,000,000	$ 277,000,000
Other Notes Payable	1,560,000,000	1,560,000,000
Other Liabilities, Noncurrent	87,066,000	76,038,000
Total Long Term Liabilities	2,020,066,000	1,913,038,000
Senior Credit Facility Details [Abstract]
Revolving Bank Loan Comitment Value	1,000,000,000
Max Revolving Bank Loan Comitment Value	1,250,000,000
Letters Of Credit Available Credit Facility	250,000,000
Debt Instrument Interest Rate Terms Prime	1.00%
Debt Instrument Interest Rate Terms Libor	2.00%
Notes Payable to Bank	373,000,000	277,000,000
Debt Instrument, Unused Borrowing Capacity, Amount	$ 627,000,000