The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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+ Details

Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Debt Instrument [Line Items]
Land improvements to District in exchange for bonds	$ 28.6
Estimated fair value of bonds	8.9
Other-than-temporary impairment on bonds			1.0
Scheduled payments recorded as a reduction to the carrying value of the bonds	0.7	0.5
Cash contribution committed to Richmond American Homes Foundation	0	0	1.0
Capital Appreciation Bonds [Member]
Debt Instrument [Line Items]
Bonds received from District in exchange for land improvements	22.5
Subordinate Bond [Member]
Debt Instrument [Line Items]
Bonds received from District in exchange for land improvements	$ 1.6