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Retirement Plans | 3 Months Ended
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Mar. 31, 2018
Retirement Benefits [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 2017 Annual Report. The following tables provide information regarding the Pension Plan:
|  | Pension Plan
|  | Quarter ended March 31,
($ in thousands) |  | 2018 |  | 2017
Net Periodic Benefit Cost: |  |  |  |
Interest cost |  | $ | 3,095 |  |  | 3,111 |
Expected return on plan assets |  | (5,682 | ) |  | (4,854 | )
Amortization of unrecognized net actuarial loss |  | 494 |  |  | 481 |
Total net periodic benefit |  | $ | (2,093 | ) |  | (1,262 | )
|  | Pension Plan
|  | Quarter ended March 31,
|  | 2018 |  | 2017
Weighted-Average Expense Assumptions: |  |  |  |
Discount rate |  | 3.78 | % |  | 4.41 | %
Effective interest rate for calculation of interest cost |  | 3.46 |  |  | 3.84 |
Expected return on plan assets |  | 6.36 |  |  | 6.24 |

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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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