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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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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+ Details

Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Investment Holdings, Other than Securities [Line Items]
Other than Temporary Impairment Losses, Investments	$ 0	$ 0	$ 78,802,000
Central Region [Member]
Investment Holdings, Other than Securities [Line Items]
Other than Temporary Impairment Losses, Investments			6,963,000
Metro [Member]
Investment Holdings, Other than Securities [Line Items]
Other than Temporary Impairment Losses, Investments			64,060,000
United Kingdom [Member]
Investment Holdings, Other than Securities [Line Items]
Other than Temporary Impairment Losses, Investments			$ 7,779,000