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Retirement Plans | 6 Months Ended
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Jun. 30, 2021
Retirement Benefits [Abstract] |
Retirement Plans | Retirement Plans The funded status of our defined benefit plans, which represents the difference between the fair value of plan assets and the projected benefit obligations, is recognized in our balance sheet with a corresponding adjustment to accumulated other comprehensive income (loss). Gains and losses for the differences between actuarial assumptions and actual results, and unrecognized service costs, are recognized through accumulated other comprehensive income (loss). These amounts will be subsequently recognized as net periodic pension cost (income) within the statement of operations. Our United Kingdom subsidiary has a defined benefit pension plan covering all eligible employees (the “UK Plan”); however, no individual joining the company after October 31, 2001 may participate in the UK Plan. On May 31, 2010, we curtailed the future accrual of benefits for active employees under such plan. We also sponsor three domestic retirement plans in which participation by new individuals is frozen. NOTE 12 - Retirement Plans (Continued) Components of Net Periodic Pension Cost The components of net periodic pension cost (income) of the UK Plan for the three and six months ended June 30, 2021 and 2020 were as follows (in thousands):
| For the three months ended June 30, |  | For the six months ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Interest cost | $ | 1,350 |  |  | $ | 1,556 |  |  | $ | 2,686 |  |  | $ | 3,152 |
Expected return on plan assets | (3,223) |  |  | (2,922) |  |  | (6,415) |  |  | (5,919) |
Amortization of unrecognized loss | 922 |  |  | 581 |  |  | 1,835 |  |  | 1,176 |
Net periodic pension cost (income) | $ | (951) |  |  | $ | (785) |  |  | $ | (1,894) |  |  | $ | (1,591) |
The net periodic pension cost associated with the domestic plans was approximately $0.1 million for each of the three and six months ended June 30, 2021 and 2020. Employer Contributions For the six months ended June 30, 2021, our United Kingdom subsidiary contributed approximately $2.5 million to the UK Plan and anticipates contributing an additional $2.5 million during the remainder of 2021.

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