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Retirement Plans (Tables)
3 Months Ended
Mar. 31, 2018
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, 2018 and 2017 were as follows (in thousands): 
 
For the three months ended March 31,
 
2018
 
2017
Interest cost
$
2,099

 
$
2,045

Expected return on plan assets
(3,581
)
 
(3,204
)
Amortization of unrecognized loss
682

 
698

Net periodic pension cost (income)
$
(800
)
 
$
(461
)