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Retirement Plans (Tables)
 9 Months Ended
Sep. 30, 2017
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, 2017 and 2016 were as follows (in thousands): 
 
For the three months ended September 30,
 
For the nine months ended September 30,
 
2017
 
2016
 
2017
 
2016
Interest cost
$
2,162

 
$
2,465

 
$
6,331

 
$
7,846

Expected return on plan assets
(3,388
)
 
(3,398
)
 
(9,919
)
 
(10,816
)
Amortization of unrecognized loss
738

 
489

 
2,160

 
1,556

Net periodic pension cost (income)
$
(488
)
 
$
(444
)
 
$
(1,428
)
 
$
(1,414
)