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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (Unaudited) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Sep. 30, 2011
Condensed Consolidated Statements of Comprehensive Income [Abstract]      
Unrealized gain on available-for-sale securities, net $ 58 $ 35 $ 0