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Retirement Plans (Tables)
6 Months Ended
Jun. 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 six months ended June 30, 2018 and 2017 were as follows (in thousands): 
 
For the three months ended June 30,
 
For the six months ended June 30,
 
2018
 
2017
 
2018
 
2017
Interest cost
$
2,045

 
$
2,124

 
$
4,144

 
$
4,169

Expected return on plan assets
(3,490
)
 
(3,327
)
 
(7,071
)
 
(6,531
)
Amortization of unrecognized loss
665

 
724

 
1,347

 
1,422

Net periodic pension cost (income)
$
(780
)
 
$
(479
)
 
$
(1,580
)
 
$
(940
)