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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME |  |  |  |
Net actuarial gain (loss), tax | $ 822 | $ 4,317 | $ 2,637 | $ 3,968
Pension settlement expense, tax | 313 | 296 | 882 | 964
Amortization of unrecognized net periodic benefit costs, tax | 496 | 330 | 1,410 | 1,126
Change in unrealized income (loss) on interest rate swap, tax | 168 | 312 | 278 | 389
Change in foreign currency translation, tax | $ 127 | $ 225 | $ 158 | $ 351

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