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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Statement of Other Comprehensive Income [Abstract]    
Unrealized gain (loss) on investments, tax $ 0 $ 3,475
Pension liability adjustments, tax $ 527 $ 491