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Retirement Plans (Tables)
 9 Months Ended
Sep. 30, 2019
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, 2019 and 2018 were as follows (in thousands): 
 
For the three months ended September 30,
 
For the nine months ended September 30,
 
2019
 
2018
 
2019
 
2018
Interest cost
$
1,925

 
$
1,959

 
$
5,968

 
$
6,103

Expected return on plan assets
(2,941
)
 
(3,344
)
 
(9,121
)
 
(10,415
)
Amortization of unrecognized loss
566

 
638

 
1,756

 
1,985

Net periodic pension cost (income)
$
(450
)
 
$
(747
)
 
$
(1,397
)
 
$
(2,327
)