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Retirement Plans
 9 Months Ended
Sep. 30, 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 and nine months ended September 30, 2014 and 2013 were as follows (in thousands): 
 
For the three months ended September 30,
 
For the nine months ended September 30,
 
2014
 
2013
 
2014
 
2013
Interest cost
$
3,510

 
$
3,044

 
$
10,573

 
$
9,147

Expected return on plan assets
(4,226
)
 
(3,549
)
 
(12,729
)
 
(10,664
)
Amortization of unrecognized loss
508

 
633

 
1,530

 
1,902

Net periodic pension (income) expense
$
(208
)
 
$
128

 
$
(626
)
 
$
385




Employer Contributions
For the nine months ended September 30, 2014, our United Kingdom subsidiary contributed approximately $4.6 million to its UK Plan. It anticipates contributing an additional $1.3 million during the remainder of 2014.