Amounts recognized, net of tax, in Accumulated other comprehensive loss for the years ended December 31, 2013 and 2012 consist of  (in thousands): Unrecognized amounts currently recorded to Accumulated other comprehensive loss that are expected to be recognized as compo- nents of next year’s net pension benefit cost include $0.1 million for the amortization of the transition asset and $0.5 million of  unrecognized net actuarial loss. The components of net periodic pension cost under this plan for the years ended December 31, 2013, 2012, and 2011 included (in thousands): This net periodic pension cost was calculated using the following assumptions: Plan assets at December 31, 2013 and 2012 consisted of insurance contracts with returns equal to the contractual rate, which are  comparable with governmental debt securities. Our expected long-term rate of return assumptions are based on the weighted-average  contractual rates for each contract. Dutch law dictates the minimum requirements for pension funding. Our goal is to meet these  minimum funding requirements, while our insurance carrier invests to minimize risks associated with future benefit payments. 52 2013 2012 Weighted average assumed discount rate 3.60% 5.00% Expected long-term rate of return on plan assets 3.30% 3.40% Weighted average rate of compensation increase 3.00% 3.00% 2013 2012 2011 Service cost $ 1,582 $ 1,127 $ 1,352 Interest cost 1,676 1,684 1,743 Expected return on plan assets (1,291) (1,214) (752) Unrecognized pension asset, net (87) (87) (87) Prior service cost 159 159 159 Unrecognized net actuarial loss 468 — 326 Net periodic pension cost $ 2,507 $ 1,669 $ 2,741 2013 2012 Prior service cost $ (55) $   (616) Transition asset 131 195 Unrecognized net actuarial loss and foreign exchange (8,702) (7,992) Total Accumulated other comprehensive loss $ (8,626) $ (8,413)