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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Thousands
 7 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 25, 2014
May. 28, 2015
May. 29, 2014
May. 30, 2013
Change in unrealized gain on available for sale investments, net of tax benefit $ 0 $ 0 $ 0 $ 1 $ 1
Pension gain (loss) arising during period, net of tax effect (benefit) (42) 0 (570) (668) 49
Amortization of the net actuarial loss and prior service credit related to the pension, net of tax effect 84 0 127 114 119
Amortization of loss on swap agreement, net of tax effect 0 0 0 0 41
Fair market value adjustment of interest rate swap, net of tax effect (benefit) (25) 9 (110) (65) (4)
Reclassification adjustment on interest rate swap included in interest expense, net of tax effect $ 43 $ 45 $ 77 $ 76 $ 16