The estimated actuarial loss and prior service credit that will be amortized from accumulated other  comprehensive loss into net periodic benefit cost over the next fiscal year is approximately $5.3 million and $9.7  million, respectively. In connection with collective bargaining agreements, we contribute to several multiemployer welfare plans.  These plans provide medical benefits to active and retired employees covered under the respective collective  bargaining agreement. Contributions are made in accordance with the formula in the relevant agreement.  Postretirement costs related to these plans are not reflected above and were approximately $18 million in 2014 ,  $20  million in 2013 and $18 million in 2012. The changes in the benefit obligation and plan assets and other amounts recognized in other comprehensive  income/loss were as follows:  Weighted-average assumptions used in the actuarial computations to determine the postretirement benefit  obligations were as follows: THE NEW YORK TIMES COMPANY – P. 89 (In thousands) December 28, 2014 December 29, 2013 Change in benefit obligation Benefit obligation at beginning of year $ 100,932 $ 120,767 Service cost 580 1,089 Interest cost 3,722 4,101 Plan participantsGLYPH<146> contributions 3,834 4,861 Actuarial loss/(gain) 12,091 (13,501) Plan amendments (25,489) (1,690) Benefits paid (14,616) (14,695) Benefit obligation at the end of year 81,054 100,932 Change in plan assets Fair value of plan assets at beginning of year GLYPH<151> GLYPH<151> Employer contributions 10,782 9,834 Plan participantsGLYPH<146> contributions 3,834 4,861 Benefits paid (14,616) (14,695) Fair value of plan assets at end of year GLYPH<151> GLYPH<151> Net amount recognized $ (81,054) $ (100,932) Amount recognized in the Consolidated Balance Sheets Current liabilities $ (9,426) $ (10,329) Noncurrent liabilities (71,628) (90,603) Net amount recognized $ (81,054) $ (100,932) Amount recognized in accumulated other comprehensive loss Actuarial loss $ 37,339 $ 33,406 Prior service credit (51,950) (33,660) Total $ (14,611) $ (254) December 28, 2014 December 29, 2013 Discount rate 3.61% 4.22% Estimated increase in compensation level 3.50% 3.50%