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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Statement of Other Comprehensive Income [Abstract]        
Unrealized gain (loss) on investments, tax $ 0 $ 3,276 $ 0 $ 199
Pension liability adjustments, tax $ 586 $ 491 $ 1,113 $ 982