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Condensed Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Other comprehensive income (loss), net of tax:
Net deferred income taxes of realized gains on marketable securities	$ (2)	$ (87)
Net of deferred income taxes on unrealized losses on marketable securities	(9)	0
Net of deferred income taxes of changes in fair value of marketable securities	$ 655	$ 486

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Tax effect of the appreciation (loss) in the value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) losses.

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Tax effect of the income statement impact of the reclassification adjustment for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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Tax effect of unrealized holding gain (loss) before reclassification adjustments and transfers on available-for-sale securities.

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