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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Amortization of actuarial gain income tax portion   $ 43   $ 145
Maximum        
Amortization of actuarial gain income tax portion $ 100   $ 100