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Retirement Plans
 6 Months Ended
Jun. 30, 2013
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, 2013 and 2012 were as follows (in thousands): 
 
For the three months ended June 30,
 
For the six months ended June 30,
 
2013
 
2012
 
2013
 
2012
Interest cost
$
3,033

 
$
3,114

 
$
6,103

 
$
6,221

Expected return on plan assets
(3,536
)
 
(3,264
)
 
(7,115
)
 
(6,521
)
Amortization of unrecognized loss
631

 
609

 
1,269

 
1,217

Net periodic pension cost
$
128

 
$
459

 
$
257

 
$
917


Employer Contributions
For the six months ended June 30, 2013, our United Kingdom subsidiary contributed approximately $2.6 million to its defined benefit pension plan. It anticipates contributing an additional $2.7 million during the remainder of 2013.