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Retirement Plans (Tables)
3 Months Ended
Mar. 31, 2021
Retirement Benefits [Abstract]  
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)