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Retirement Plans (Tables)
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Components Of Net Periodic Pension Cost The components of net periodic pension cost of the UK Plan for the three and nine months ended September 30, 2018 and 2017 were as follows (in thousands): 
 
For the three months ended September 30,
 
For the nine months ended September 30,
 
2018
 
2017
 
2018
 
2017
Interest cost
$
1,959

 
$
2,162

 
$
6,103

 
$
6,331

Expected return on plan assets
(3,344
)
 
(3,388
)
 
(10,415
)
 
(9,919
)
Amortization of unrecognized loss
638

 
738

 
1,985

 
2,160

Net periodic pension cost (income)
$
(747
)
 
$
(488
)
 
$
(2,327
)
 
$
(1,428
)