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Retirement Plans | 3 Months Ended
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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.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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