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Retirement Plans
 3 Months Ended
Mar. 31, 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 11 - Retirement Plans (Continued)
Components of Net Periodic Pension Cost
The components of net periodic pension cost (income) of the UK Plan for the three months ended March 31, 2021 and 2020 were as follows (in thousands): 
 For the three months ended
March 31,
 20212020
Interest cost$1,336 $1,596 
Expected return on plan assets(3,192)(2,997)
Amortization of unrecognized loss913 595 
Net periodic pension cost (income)$(943)$(806)
The net periodic pension cost associated with the domestic plans was less than $0.1 million for each of the three months ended March 31, 2021 and 2020.
Employer Contributions
For the three months ended March 31, 2021, our United Kingdom subsidiary contributed approximately $1.2 million to the UK Plan and anticipates contributing an additional $3.8 million during the remainder of 2021. No contributions were made to our domestic plans for the three months ended March 31, 2021.