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Retirement Plans | 6 Months Ended
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Jun. 30, 2011
Retirement Plans [Abstract] |
Retirement Plans | NOTE 10. Retirement Plans The following tables show the costs of the Retirement Income Plan for Selective Insurance Company of America ("Retirement Income Plan") and the retirement life insurance component ("Retirement Life Plan") of the Selective Insurance Company of America Welfare Benefits Plan. For more information concerning these plans, refer to Note 15. "Retirement Plans" in Item 8. "Financial Statements and Supplementary Data." of our 2010 Annual Report.
|  | Retirement Income Plan |  | Retirement Life Plan
|  | Quarter ended June 30, |  | Quarter ended June 30,
($ in thousands) |  | 2011 |  | 2010 |  | 2011 |  | 2010
Components of Net Periodic Benefit Cost: |  |  |  |  |  |  |  |
Service cost | $ | 2,174 |  | 1,945 |  | - |  | -
Interest cost |  | 3,155 |  | 3,090 |  | 76 |  | 79
Expected return on plan assets |  | (3,481) |  | (2,810) |  | - |  | -
Amortization of unrecognized prior service cost |  | 38 |  | 38 |  | - |  | -
Amortization of unrecognized net loss |  | 1,099 |  | 1,171 |  | 5 |  | 1
Net periodic cost | $ | 2,985 |  | 3,434 |  | 81 |  | 80
|  | Retirement Income Plan |  | Retirement Life Plan
|  | Six Months ended June 30, |  | Six Months ended June 30,
($ in thousands) |  | 2011 |  | 2010 |  | 2011 |  | 2010
Components of Net Periodic Benefit Cost: |  |  |  |  |  |  |  |
Service cost | $ | 4,347 |  | 3,942 |  | - |  | -
Interest cost |  | 6,310 |  | 6,015 |  | 153 |  | 158
Expected return on plan assets |  | (6,963) |  | (5,626) |  | - |  | -
Amortization of unrecognized prior service cost |  | 75 |  | 75 |  | - |  | -
Amortization of unrecognized net loss |  | 2,200 |  | 2,095 |  | 9 |  | 3
Net periodic cost | $ | 5,969 |  | 6,501 |  | 162 |  | 161
Weighted-Average Expense Assumptions |  |  |  |  |  |  |  |
for the years ended December 31: |  |  |  |  |  |  |  |
Discount rate |  | 5.55 | % | 5.93 |  | 5.55 | % | 5.93
Expected return on plan assets |  | 8.00 |  | 8.00 |  | - |  | -
Rate of compensation increase |  | 4.00 |  | 4.00 |  | - |  | -
We presently anticipate contributing $8.4 million to the Retirement Income Plan in 2011, $4.7 million of which has been funded as of June 30, 2011.

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