Long Term Liabilities (Details) (USD $)	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Long Term Obligations [Abstract]
Notes Payable to Bank	$ 320,000,000	$ 277,000,000
Other Notes Payable	1,560,000,000	1,560,000,000
Other Liabilities, Noncurrent	83,910,000	76,038,000
Total Long Term Liabilities	1,963,910,000	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	1.25%
Debt Instrument Interest Rate Terms Libor	2.25%
Notes Payable to Bank	320,000,000	277,000,000
Debt Instrument, Unused Borrowing Capacity, Amount	$ 680,000,000