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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (Unaudited) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Statement of Other Comprehensive Income [Abstract]    
Unrealized gain (loss) on available-for-sale securities, net $ 64 $ 23