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Retirement Plans | 9 Months Ended
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Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract] |
Retirement Plans | Retirement Plans The following tables show the net periodic benefit cost related to the Retirement Income Plan for Selective Insurance Company of America (“Retirement Income Plan”) and the life insurance benefits provided to eligible Selective Insurance Company of America retirees (referred to as the "Retirement Life Plan"). The Retirement Income Plan was amended in the first quarter of 2013 to curtail the accrual of additional benefits for all eligible employees after March 31, 2016. For more information concerning these plans, refer to Note 15. “Retirement Plans” in Item 8. “Financial Statements and Supplementary Data.” of our 2014 Annual Report.
|  | Retirement Income Plan Quarter ended September 30, |  | Retirement Life Plan Quarter ended September 30,
($ in thousands) |  | 2015 |  | 2014 |  | 2015 |  | 2014
Components of Net Periodic Benefit Cost: |  |  |  |  |  |  |  |  |  |  |  |
Net Periodic Benefit Cost: |  |  |  |  |  |  |  |
Service cost |  | $ | 1,964 |  |  | 1,627 |  |  | $ | — |  |  | — |
Interest cost |  | 3,501 |  |  | 3,253 |  |  | 64 |  |  | 73 |
Expected return on plan assets |  | (3,991 | ) |  | (3,919 | ) |  | — |  |  | — |
Amortization of unrecognized net actuarial loss |  | 1,696 |  |  | 367 |  |  | 13 |  |  | 14 |
Total net periodic cost |  | $ | 3,170 |  |  | 1,328 |  |  | $ | 77 |  |  | 87 |
|  | Retirement Income Plan Nine Months ended September 30, |  | Retirement Life Plan Nine Months ended September 30,
($ in thousands) |  | 2015 |  | 2014 |  | 2015 |  | 2014
Components of Net Periodic Benefit Cost: |  |  |  |  |  |  |  |  |  |  |  |
Net Periodic Benefit Cost: |  |  |  |  |  |  |  |
Service cost |  | $ | 5,891 |  |  | 4,880 |  |  | $ | — |  |  | — |
Interest cost |  | 10,504 |  |  | 9,760 |  |  | 190 |  |  | 219 |
Expected return on plan assets |  | (11,972 | ) |  | (11,756 | ) |  | — |  |  | — |
Amortization of unrecognized net actuarial loss |  | 5,086 |  |  | 1,102 |  |  | 41 |  |  | 40 |
Total net periodic cost |  | $ | 9,509 |  |  | 3,986 |  |  | $ | 231 |  |  | 259 |
|  | Retirement Income Plan Nine Months ended September 30, |  | Retirement Life Plan Nine Months ended September 30,
|  | 2015 |  | 2014 |  | 2015 |  | 2014
Weighted-Average Expense Assumptions: |  |  |  |  |  |  |  |
Discount rate |  | 4.29 | % |  | 5.16 |  | 4.08 | % |  | 4.85
Expected return on plan assets |  | 6.27 |  |  | 6.92 |  | — |  |  | —
Rate of compensation increase |  | 4.00 |  |  | 4.00 |  | — |  |  | —
We presently anticipate contributing $11.9 million to the Retirement Income Plan in 2015, $9.6 million of which has been funded as of September 30, 2015.

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