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Retirement Plans (Table)

6 Months Ended

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 cost1		$	(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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- References

No definition available.

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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

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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

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