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Condensed Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Consolidated Statements Of Comprehensive Income [Abstract]      
Unrealized gain (loss) on investments, tax expense (benefit) $ 68 $ (64) $ 108
Unrealized (loss) gain, tax (benefit) expense (921) 398 (372)
Reclassification adjustment for (gains) losses included in net income, tax (expense) benefit $ (1,623) $ 1,941 $ 612