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Deferred Charges, Net (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Deferred Charges, Net [Abstract]
Amortization expense of deferred charges	$ 8.0	$ 7.4	$ 10.8
Accumulated amortization of deferred lease origination costs	18.5
Accumulated amortization of deferred financing costs	$ 8.0

For an unclassified balance sheet, the accumulated amortization, as of the reporting date, which represents the periodic charge to earnings of initial direct costs which have been deferred and are being allocated over the lease term in proportion to the recognition of rental income.

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