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CONDENSED 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
Amortization of actuarial gain income tax portion   $ 44   $ 102
Maximum        
Amortization of actuarial gain income tax portion $ 100   $ 100