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Retirement Plans
 3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Retirement Plans
Retirement Plans    
Our United Kingdom subsidiary has a defined benefit pension plan covering all eligible employees (the “UK Plan”); however, no individual joining the company after October 31, 2001 may participate in the UK Plan. On May 31, 2010, we curtailed the future accrual of benefits for active employees under such plan.
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
)
 

Employer Contributions
For the three months ended March 31, 2017, our United Kingdom subsidiary contributed approximately $1.1 million to the UK Plan and anticipates contributing an additional $3.4 million during the remainder of 2017.