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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Other comprehensive income (loss), net of tax:      
Net deferred income taxes of realized gains on marketable securities $ (618) $ (322) $ (125)
Net of deferred income taxes on unrealized losses on marketable securities 27 120 24
Net of deferred income taxes of changes in fair value of marketable securities $ 304 $ 386 $ 842