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Consolidated Statements of Income and Comprehensive Income Parenthetical (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Other comprehensive loss:
Unrealized loss on investment, taxes	$ 59	$ 30	$ 4,334
Reclassification adjustment for gain realized on investment, taxes	$ 0	$ 7,494	$ 0

Tax effect on the reclassification adjustment for gains or losses realized upon the sale of securities during the period.

Tax effect on gross appreciation or the gross loss in value of the total of unsold securities during the period being reported on.