The pension benefit plan obligations and funded status at December 31, 2013 and 2012, are as follows: The accumulated benefit obligation was $22.9 million and $20.8 million at December 31, 2013 and 2012, respectively. The net amounts recognized in the balance sheet for the unfunded pension liability as of December 31, 2013 and 2012 are as follows: The components of net periodic pension cost and amounts recognized in other comprehensive income for the year ended December 31, 2013 and the period May 4, 2012 to December 31, 2012 are as follows: 60 ADTRAN 2013 Annual Report (In thousands) 2013 2012 Change in projected benefit obligation: Projected benefit obligation at beginning of period $(21,181) $—  Business combination — (18,063)  Service cost (1,198) (766)  Interest cost (745) (494)  Actuarial gain (loss) 779 (1,862)  Benefit payments (1) —  Foreign currency exchange rate changes (1,008) 4 Projected benefit obligation at end of period $(23,354) $(21,181) Change in plan assets: Fair value of plan assets at beginning of period $18,620 $—  Business combination — 18,063  Actual return on plan assets 1,281 592  Foreign currency exchange rate changes 872 (35) Fair value of plan assets at end of period $20,773 $18,620 Funded status at end of period $(2,581) $(2,561) (In thousands)  2013 2012 Current liability — $(609) Non-current liability (2,581) (1,952) Total $(2,581) $(2,561) (In thousands) Year Ended December 31, 2013 May 4, 2012 to December 31, 2012 Net periodic benefit cost: Service cost $1,198 $766 Interest cost 745 494 Expected return on plan assets (1,010) (674) Net periodic benefit cost 933 586 Other changes in plan assets and benefit obligations recognized in other comprehensive income: Net actuarial (gain) loss (779) 1,862 Net unrealized (gain) loss on plan assets (282) 90 Other comprehensive (income) loss (1,061) 1,952 Total recognized in net periodic benefit cost and other comprehensive income $(128) $2,538