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Retirement Plans (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2017 and 2016 were as follows (in thousands): 
 
For the three months ended June 30,
 
For the six months ended June 30,
 
2017
 
2016
 
2017
 
2016
Interest cost
$
2,124

 
$
2,696

 
$
4,169

 
$
5,381

Expected return on plan assets
(3,327
)
 
(3,717
)
 
(6,531
)
 
(7,418
)
Amortization of unrecognized loss
724

 
535

 
1,422

 
1,067

Net periodic pension cost (income)
$
(479
)
 
$
(486
)
 
$
(940
)
 
$
(970
)