pre_text: Postretirement Benefit Plans The Company also provides certain postretirement health care and life insurance benefits to qualifying domestic retirees and their eligible dependents. The health care plan for shore-based employees and their dependents and seagoing licensed deck officers (“Deck Officers”) and their dependents is contributory at retirement, while the life insurance plan for all employees is noncontributory. In general, postretirement medical coverage is provided to shore-based employees hired prior to January 1, 2005 and all Deck Officers who retire and have met minimum age and service requirements under a formula related to total years of service. The Company no longer provides prescription drug coverage to its retirees or their beneficiaries once they reach age 65. The Company does not currently fund these benefit arrangements and has the right to amend or terminate the health care and life insurance benefits at any time. Information with respect to the domestic pension and postretirement benefit plans for which the Company uses a December 31 measurement date, follow:
table: 2019 2018 2019 2018
table: At December 31, Change in benefit obligation: Change in benefit obligation:
table: Benefit obligation at beginning of year $44,015 $48,500 $3,401 $4,548
table: Cost of benefits earned (service cost) — — 105 119
table: Interest cost on benefit obligation 1,802 1,673 140 142
table: Actuarial losses/(gains) 3,805 (3,456) 84 (1,206)
table: Benefits paid (2,686) (2,702) (158) (202)
table: Benefit obligation at year end 46,936 44,015 3,572 3,401
table: Change in plan assets:
table: Fair value of plan assets at beginning of year 31,929 35,591 — —
table: Actual return on plan assets 6,790 (1,882) — —
table: Employer contributions 721 922 158 202
table: Benefits paid (2,686) (2,702) (158) (202)
table: Fair value of plan assets at year end 36,754 31,929 — —
table: Unfunded status at December 31 $(10,182) $(12,086) $(3,572) $(3,401)
question: Analyse this data from a financial earnings document. What is the change in Interest cost on benefit obligation for pension benefits from December 31, 2018 and 2019?