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Retirement Plans (Table) | 6 Months Ended
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Jun. 30, 2018
Retirement Benefits [Abstract] |
Schedule of Components of Net Periodic Benefit Cost |
|  | Pension Plan |  | Pension Plan
|  | Quarter ended June 30, |  | Six Months ended June 30,
($ in thousands) |  | 2018 |  | 2017 |  | 2018 |  | 2017
Net Periodic Benefit Cost: |  |  |  |  |  |  |  |
Interest cost |  | $ | 3,095 |  |  | 3,110 |  |  | 6,190 |  |  | 6,221 |
Expected return on plan assets |  | (5,681 | ) |  | (4,855 | ) |  | (11,363 | ) |  | (9,709 | )
Amortization of unrecognized net actuarial loss |  | 493 |  |  | 482 |  |  | 987 |  |  | 963 |
Total net periodic benefit cost 1 |  | $ | (2,093 | ) |  | (1,263 | ) |  | (4,186 | ) |  | (2,525 | )
1 The components of net periodic benefit cost are included within "Loss and loss expense incurred" and "Other insurance expenses" on the Consolidated Statements of Income.
Schedule of Weighted-Average Expense Assumptions |
|  | Pension Plan
|  | Six Months ended June 30,
|  | 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 Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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