Supplemental Cash Flow Information (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Supplemental Cash Flow Information [Line Items]
Intercompany Subvention Receivable	$ 24,900,000	$ 25,400,000
Interest Paid	90,277,000	56,940,000
Income Taxes Paid	$ 40,000	$ 2,590,000