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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Statement of Comprehensive Income [Abstract]        
Unrealized gain (loss) on investments, tax $ 0 $ 0 $ 0 $ 0
Pension liability adjustments, tax $ (126) $ (291) $ (430) $ (645)