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Retirement Plans (Tables)
3 Months Ended
Mar. 31, 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 months ended March 31, 2020 and 2019 were as follows (in thousands): 
 
For the three months ended March 31,
 
2020
 
2019
Interest cost
$
1,596

 
$
2,039

Expected return on plan assets
(2,997
)
 
(3,116
)
Amortization of unrecognized loss
595

 
600

Net periodic pension cost (income)
$
(806
)
 
$
(477
)