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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) (Parentheticals) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Statement Of Income and Comprehensive Income [Abstract]        
Tax effect of other comprehensive income $ 0 $ 0 $ 0 $ 0