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Retirement Plans (Tables)
3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Components Of Net Periodic Pension Cost The components of net periodic pension cost of the UK Plan for the three months ended March 31, 2019 and 2018 were as follows (in thousands): 
 
For the three months ended March 31,
 
2019
 
2018
Interest cost
$
2,039

 
$
2,099

Expected return on plan assets
(3,116
)
 
(3,581
)
Amortization of unrecognized loss
600

 
682

Net periodic pension cost (income)
$
(477
)
 
$
(800
)