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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (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 Other Comprehensive Income [Abstract]        
Unrealized gain (loss) on investments, tax $ 3,276 $ 7,886 $ 199 $ 7,351
Pension liability adjustments, tax $ 491 $ 364 $ 982 $ 727