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Retirement Plans
 6 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
Retirement Plans Retirement Plans
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.
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, 2020 and 2019 were as follows (in thousands): 
 For the three months ended
June 30,		For the six months ended
June 30,
 2020201920202019
Interest cost$1,556  $2,004  $3,152  $4,043  
Expected return on plan assets(2,922) (3,064) (5,919) (6,180) 
Amortization of unrecognized loss581  590  1,176  1,190  
Net periodic pension cost (income)$(785) $(470) $(1,591) $(947) 
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, 2020 and 2019.
Employer Contributions
For the six months ended June 30, 2020, our United Kingdom subsidiary contributed approximately $2.1 million to the UK Plan and anticipates contributing an additional $2.4 million during the remainder of 2020. Contributions to the domestic plans were approximately $0.1 million for the six months ended June 30, 2020.