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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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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

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