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Retirement Plans
 9 Months Ended
Sep. 30, 2016
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 and nine months ended September 30, 2016 and 2015 were as follows (in thousands): 
 
For the three months ended September 30,
 
For the nine months ended September 30,
 
2016
 
2015
 
2016
 
2015
Interest cost
$
2,465

 
$
2,938

 
$
7,846

 
$
8,718

Expected return on plan assets
(3,398
)
 
(4,098
)
 
(10,816
)
 
(12,159
)
Amortization of unrecognized loss
489

 
640

 
1,556

 
1,899

Net periodic pension cost
$
(444
)
 
$
(520
)
 
$
(1,414
)
 
$
(1,542
)

Employer Contributions
For the nine months ended September 30, 2016, our United Kingdom subsidiary contributed approximately $3.4 million to the UK Plan and anticipates contributing an additional $1.4 million during the remainder of 2016.