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Retirement Plans
 3 Months Ended
Mar. 31, 2014
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 months ended March 31, 2014 and 2013 were as follows (in thousands): 
 
For the three months ended March 31,
 
2014
 
2013
Interest cost
$
3,498

 
$
3,070

Expected return on plan assets
(4,211
)
 
(3,579
)
Amortization of unrecognized loss
506

 
638

Net periodic pension (income) expense
$
(207
)
 
$
129


Employer Contributions
For the three months ended March 31, 2014, our United Kingdom subsidiary contributed approximately $1.4 million to its defined benefit pension plan. It anticipates contributing an additional $4.6 million during the remainder of 2014.