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Significant Accounting Policies Deferred Financing Costs (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Debt Instrument [Line Items]
Deferred Financing Costs	$ 14,996,000	$ 15,805,000
Interest Expense [Member]
Debt Instrument [Line Items]
Amortization of Financing Costs	8,200,000	11,900,000	17,800,000
Other Assets [Member]
Debt Instrument [Line Items]
Deferred Financing Costs	$ 15,000,000	$ 15,800,000

For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain.

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