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Principles Of Preparation (Extraordinary Gain) (Details) (USD $)	3 Months Ended		12 Months Ended		3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011	Sep. 30, 2010 Company's 6% Senior Notes
Extraordinary gain, net of income tax	$ 0	$ 0	$ 0	$ 10,286,000	$ 10,300,000
Income tax expense related to extraordinary gain					$ 5,800,000
Debt instrument stated rate					6.00%
Debt instrument maturity year					2035

This element represents the gains or losses, after tax, arising from an event or transaction that is both unusual in nature and infrequent in occurrence when considered in relation to the environment in which the entity operates and which represents the parent's portion. This amount is the income statement amount which is allocable to the parent.

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- Definition

The tax effect of gains and losses from events or transactions meeting the criteria of unusual in nature and infrequent in occurrence, thereby meeting the criteria to be classified as an extraordinary item.

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