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Retirement Plans (Tables)
6 Months Ended
Jun. 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 six months ended June 30, 2019 and 2018 were as follows (in thousands): 
 
For the three months ended June 30,
 
For the six months ended June 30,
 
2019
 
2018
 
2019
 
2018
Interest cost
$
2,004

 
$
2,045

 
$
4,043

 
$
4,144

Expected return on plan assets
(3,064
)
 
(3,490
)
 
(6,180
)
 
(7,071
)
Amortization of unrecognized loss
590

 
665

 
1,190

 
1,347

Net periodic pension cost (income)
$
(470
)
 
$
(780
)
 
$
(947
)
 
$
(1,580
)