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Retirement Plans (Tables)
 6 Months Ended
Jun. 30, 2015
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, 2015 and 2014 were as follows (in thousands): 
 
For the three months ended June 30,
 
For the six months ended June 30,
 
2015
 
2014
 
2015
 
2014
Interest cost
$
2,915

 
$
3,565

 
$
5,780

 
$
7,063

Expected return on plan assets
(4,066
)
 
(4,292
)
 
(8,061
)
 
(8,503
)
Amortization of unrecognized loss
636

 
516

 
1,259

 
1,022

Net periodic pension cost
$
(515
)
 
$
(211
)
 
$
(1,022
)
 
$
(418
)