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Retirement Plans | 6 Months Ended
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Jun. 30, 2017
Compensation and Retirement Disclosure [Abstract] |
Retirement Plans | Retirement Plans SICA's primary pension plan is the Retirement Income Plan for Selective Insurance Company of America (the “Pension Plan”). SICA also sponsors the Supplemental Excess Retirement Plan (the “Excess Plan”) and a life insurance benefit plan. All plans are closed to new entrants and benefits ceased accruing under the Pension Plan and the Excess Plan after March 31, 2016. For more information concerning SICA's retirement plans, refer to Note 14. “Retirement Plans” in Item 8. “Financial Statements and Supplementary Data.” of our 2016 Annual Report. The following tables provide information regarding the Pension Plan:
|  | Pension Plan Quarter ended June 30, |  | Pension Plan Six Months ended June 30,
($ in thousands) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Net Periodic Benefit Cost: |  |  |  |  |  |  |  |
Service cost |  | $ | — |  |  | — |  |  | — |  |  | 1,606 |
Interest cost |  | 3,110 |  |  | 3,101 |  |  | 6,221 |  |  | 6,203 |
Expected return on plan assets |  | (4,855 | ) |  | (3,988 | ) |  | (9,709 | ) |  | (7,976 | )
Amortization of unrecognized net actuarial loss |  | 482 |  |  | 1,481 |  |  | 963 |  |  | 2,961 |
Total net periodic cost |  | $ | (1,263 | ) |  | 594 |  |  | (2,525 | ) |  | 2,794 |
|  | Pension Plan Six Months ended June 30,
|  | 2017 |  | 2016
Weighted-Average Expense Assumptions: |  |  |  |
Discount rate |  | 4.41 | % |  | 4.69 | %
Effective interest rate for calculation of service cost |  | n/a |  |  | 4.52 |
Effective interest rate for calculation of interest cost |  | 3.83 |  |  | 4.02 |
Expected return on plan assets |  | 6.24 |  |  | 6.37 |
Rate of compensation increase |  | n/a |  |  | 4.00 |

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