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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Statement of Comprehensive Income [Abstract]        
Unrealized gain (loss) on investments, tax $ 0 $ 0 $ 0 $ 0
Pension liability adjustments, tax $ 291 $ 126 $ 645 $ 632