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Retirement Plans (Tables)
6 Months Ended
Jun. 30, 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 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,
 2021202020212020
Interest cost$1,350 $1,556 $2,686 $3,152 
Expected return on plan assets(3,223)(2,922)(6,415)(5,919)
Amortization of unrecognized loss922 581 1,835 1,176 
Net periodic pension cost (income)$(951)$(785)$(1,894)$(1,591)