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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Statement of Other Comprehensive Income [Abstract]        
Unrealized gain (loss) on investments, tax $ 208 $ 6,166 $ 9 $ 1,195
Pension liability adjustments, tax $ 491 $ 363 $ 1,473 $ 1,090