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Retirement Plans (Tables)
 9 Months Ended
Sep. 30, 2013
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 nine months ended September 30, 2013 and 2012 were as follows (in thousands): 
 
For the three months ended September 30,
 
For the nine months ended September 30,
 
2013
 
2012
 
2013
 
2012
Interest cost
$
3,044

 
$
3,102

 
$
9,147

 
$
9,323

Expected return on plan assets
(3,549
)
 
(3,251
)
 
(10,664
)
 
(9,772
)
Amortization of unrecognized loss
633

 
606

 
1,902

 
1,823

Net periodic pension cost
$
128

 
$
457

 
$
385

 
$
1,374