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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Statement of Comprehensive Income [Abstract]        
Unrealized gain (loss) on investments, tax $ 0 $ 0 $ 0 $ 0
Pension liability adjustments, tax $ 126 $ 557 $ 632 $ 1,670