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Benefit Plans | 6 Months Ended
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Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract] |
BENEFIT PLANS | BENEFIT PLANS We sponsor several defined benefit pension plans. Additionally, we provide varying levels of postretirement health care and life insurance benefits to some U.S. employees. The table below summarizes the components of net periodic pension (income):
| Three Months Ended December 31, |  | Six Months Ended December 31,
(in thousands) | 2015 |  | 2014 |  | 2015 |  | 2014
Service cost | $ | 1,156 |  |  | $ | 1,384 |  |  | $ | 2,319 |  |  | $ | 2,799 |
Interest cost | 9,438 |  |  | 9,745 |  |  | 18,923 |  |  | 19,681 |
Expected return on plan assets | (14,657 | ) |  | (14,900 | ) |  | (29,364 | ) |  | (29,947 | )
Amortization of transition obligation | 21 |  |  | 19 |  |  | 42 |  |  | 40 |
Amortization of prior service credit | (104 | ) |  | (71 | ) |  | (209 | ) |  | (141 | )
Recognition of actuarial losses | 1,815 |  |  | 937 |  |  | 3,648 |  |  | 1,937 |
Curtailment loss | — |  |  | 358 |  |  | — |  |  | 358 |
Special termination benefit charge | 54 |  |  | 459 |  |  | 107 |  |  | 459 |
Net periodic pension (income) | $ | (2,277 | ) |  | $ | (2,069 | ) |  | $ | (4,534 | ) |  | $ | (4,814 | )
The special termination benefit charge of $0.1 million during the six months ended December 31, 2015 is the result of lump sum payments to several terminated Executive Retirement Plan participants. During the three and six months ended December 31, 2014 we recognized a special termination benefit charge of $0.5 million and a curtailment loss of $0.4 million for one of our U.S.-based defined benefit pension plans resulting from a plant closure. The special termination benefit charge was recognized in restructuring expense. The table below summarizes the components of net periodic other postretirement benefit cost:
| Three Months Ended December 31, |  | Six Months Ended December 31,
(in thousands) | 2015 |  | 2014 |  | 2015 |  | 2014
Service cost | $ | — |  |  | $ | 27 |  |  | $ | — |  |  | $ | 54 |
Interest cost | 210 |  |  | 259 |  |  | 420 |  |  | 519 |
Amortization of prior service credit | (5 | ) |  | (28 | ) |  | (11 | ) |  | (55 | )
Recognition of actuarial loss | 81 |  |  | 207 |  |  | 162 |  |  | 414 |
Curtailment gain | — |  |  | (221 | ) |  | — |  |  | (221 | )
Net periodic other postretirement benefit cost | $ | 286 |  |  | $ | 244 |  |  | $ | 571 |  |  | $ | 711 |
The curtailment gain of $0.2 million recognized during the three and six months ended December 31, 2014 was a result of the plant closure discussed above.

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