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Retirement Plans
 6 Months Ended
Jun. 30, 2015
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 plan. On May 31, 2010, we curtailed the future accrual of benefits for active employees under this plan.
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
)



Employer Contributions
For the six months ended June 30, 2015, our United Kingdom subsidiary contributed approximately $2.8 million to its UK Plan. It anticipates contributing an additional $3.0 million during the remainder of 2015.