Supplemental Cash Flow Information (Details) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2010	Sep. 30, 2010	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2010
Supplemental Cash Flow Information [Line Items]
Intercompany Subvention Receivable			$ 20,800,000	$ 37,400,000
Interest Paid	66,399,000	90,490,000	298,432,000	283,616,000	446,699,000
Income Taxes Paid	16,974,000	28,904,000	12,083,000	4,892,000	190,825,000
Proceeds from Income Tax Refunds					$ 280,000,000