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Retirement Plans (Tables)
 6 Months Ended
Jun. 30, 2016
Compensation and Retirement Disclosure [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, 2016 and 2015 were as follows (in thousands): 
 
For the three months ended June 30,
 
For the six months ended June 30,
 
2016
 
2015
 
2016
 
2015
Interest cost
$
2,696

 
$
2,915

 
$
5,381

 
$
5,780

Expected return on plan assets
(3,717
)
 
(4,066
)
 
(7,418
)
 
(8,061
)
Amortization of unrecognized loss
535

 
636

 
1,067

 
1,259

Net periodic pension cost
$
(486
)
 
$
(515
)
 
$
(970
)
 
$
(1,022
)