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Retirement Plans
 3 Months Ended
Mar. 31, 2019
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 of the UK Plan for the three months ended March 31, 2019 and 2018 were as follows (in thousands): 
 
For the three months ended March 31,
 
2019
 
2018
Interest cost
$
2,039

 
$
2,099

Expected return on plan assets
(3,116
)
 
(3,581
)
Amortization of unrecognized loss
600

 
682

Net periodic pension cost (income)
$
(477
)
 
$
(800
)

The net periodic pension cost associated with the domestic plans was approximately $0.1 million for each of the three months ended March 31, 2019 and 2018.
Employer Contributions
For the three months ended March 31, 2019, our United Kingdom subsidiary contributed approximately $1.0 million to the UK Plan and anticipates contributing an additional $3.6 million during the remainder of 2019. Contributions to the domestic plans were approximately $0.2 million for the three months ended March 31, 2019.