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Retirement Plans (Tables)
3 Months Ended
Mar. 31, 2017
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 months ended March 31, 2017 and 2016 were as follows (in thousands): 
 
For the three months ended March 31,
 
 
2017
 
2016
 
Interest cost
$
2,045

 
$
2,685

 
Expected return on plan assets
(3,204
)
 
(3,701
)
 
Amortization of unrecognized loss
698

 
532

 
Net periodic pension cost (income)
$
(461
)
 
$
(484
)