Supplemental Cash Flow Information (Details) (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Supplemental Cash Flow Information [Line Items]
Intercompany Subvention Receivable	$ 27,200,000	$ 25,400,000
Interest Paid	145,707,000	150,718,000
Income Taxes Paid	$ 4,709,000	$ 2,138,000