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Retirement Plans | 6 Months Ended
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Jun. 30, 2016
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 UK Plan. On May 31, 2010, we curtailed the future accrual of benefits for active employees under such 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, 2016 and 2015 were as follows (in thousands):
| For the three months ended June 30, |  | For the six months ended June 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
Interest cost | $ | 2,696 |  |  | $ | 2,915 |  |  | $ | 5,381 |  |  | $ | 5,780 |
Expected return on plan assets | (3,717 | ) |  | (4,066 | ) |  | (7,418 | ) |  | (8,061 | )
Amortization of unrecognized loss | 535 |  |  | 636 |  |  | 1,067 |  |  | 1,259 |
Net periodic pension cost | $ | (486 | ) |  | $ | (515 | ) |  | $ | (970 | ) |  | $ | (1,022 | )
Employer Contributions For the six months ended June 30, 2016, our United Kingdom subsidiary contributed approximately $2.4 million to the UK Plan and anticipates contributing an additional $2.5 million during the remainder of 2016.

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