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Retirement Plans (Tables)
9 Months Ended
Sep. 30, 2020
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 nine months ended September 30, 2020 and 2019 were as follows (in thousands): 
 For the three months ended
September 30,
For the nine months ended
September 30,
 2020201920202019
Interest cost$1,613 $1,925 $4,765 $5,968 
Expected return on plan assets(3,030)(2,941)(8,949)(9,121)
Amortization of unrecognized loss602 566 1,778 1,756 
Net periodic pension cost (income)$(815)$(450)$(2,406)$(1,397)