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Retirement Plans (Tables)

12 Months Ended

Dec. 31, 2018

Defined Benefit Plan Disclosure [Line Items]

Schedule of Funded Status Of Retirement Income Plan And Retirement Life Plan

December 31,		Pension Plan
($ in thousands)		2018				2017
Change in Benefit Obligation:
Benefit obligation, beginning of year		$	364,411			330,588
Service cost		—				—
Interest cost		12,428				12,490
Actuarial (gains) losses		(31,738		)		31,158
Benefits paid		(10,422		)		(9,825	)
Benefit obligation, end of year		$	334,679			364,411
Change in Fair Value of Assets:
Fair value of assets, beginning of year		$	363,673			316,515
Actual return on plan assets, net of expenses		(21,571		)		46,983
Contributions by the employer to funded plans		—				10,000
Benefits paid		(10,422		)		(9,825	)
Fair value of assets, end of year		$	331,680			363,673
Funded status		$	(2,999	)		(738	)

Schedule of Amounts Recognized in Consolidated Balance Sheet

Amounts Recognized in the Consolidated Balance Sheet:
Liabilities		$	(2,999	)		(738	)
Net pension liability, end of year		$	(2,999	)		(738	)

Schedule of Amounts recognized in Accumulated Other than Comprehensive Income

Amounts Recognized in AOCI:
Net actuarial loss		$	98,057			87,438
Total		$	98,057			87,438

Schedule of Other Information as of December 31

Other Information as of December 31:
Accumulated benefit obligation		$	334,679			364,411

Schedule of Components Of Net Periodic Benefit Cost And Other Amounts Recognized In Other Comprehensive Income

		Pension Plan
($ in thousands)		2018				2017			2016
Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Income:
Net Periodic Benefit Cost:
Service cost		$	—			—			1,647
Interest cost		12,428				12,490			12,336
Expected return on plan assets		(22,767		)		(19,419	)		(17,309	)
Amortization of unrecognized actuarial loss		1,981				2,001			6,299
Total net periodic cost		$	(8,358	)		(4,928	)		2,973
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income:
Net actuarial loss (gain)		$	12,600			3,594			11,316
Reversal of amortization of net actuarial loss		(1,981		)		(2,001	)		(6,299	)
Total recognized in other comprehensive income		$	10,619			1,593			5,017
Total recognized in net periodic benefit cost and other comprehensive income		$	2,261			(3,335	)		7,990

Schedule Of Weighted- Average Expense and Liability Assumptions

		Pension Plan
		2018			2017		2016
Weighted-Average Expense Assumptions for the years ended December 31:
Discount rate		3.78	%		4.41		4.69
Expected return on plan assets		6.36			6.24		6.37
Rate of compensation increase1		—			—		—

Weighted-Average Liability Assumptions as of December 31:
Discount rate		4.46	%		3.78

Schedule of Allocation of Plan Assets

		2018						2017
		Target Percentage2			Actual Percentage			Actual Percentage
Return seeking assets1		15%-70%			43	%		58	%
Liability hedging assets		35%-75%			38	%		40	%
Short-term investments3		0%-2%			19	%		2	%
Total		100	%		100	%		100	%

Schedule of Quantitative Disclosures of our Financial Assets that were Measured at Fair Value

December 31, 2018						Fair Value Measurements Using
($ in thousands)		Assets Measured at Fair Value				Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1)1			Significant Other Observable Inputs (Level 2)1			Significant Unobservable Inputs  (Level 3)
Description
Measured on a recurring basis:
AFS fixed income securities:
U.S. government and government agencies		$	121,310			78,381			42,929			—
Foreign government		23,131				—			23,131			—
Obligations of states and political subdivisions		1,138,469				—			1,138,469			—
Corporate securities		1,617,408				—			1,617,408			—
CLO and other ABS		717,362				—			709,953			7,409
CMBS		527,078				—			527,078			—
RMBS		1,128,342				—			1,128,342			—
Total AFS fixed income securities		5,273,100				78,381			5,187,310			7,409
Equity securities:
Common stock2		144,727				107,397			—			—
Preferred stock		2,912				2,912			—			—
Total equity securities		147,639				110,309			—			—
Short-term investments		323,864				321,370			2,494			—
Total assets measured at fair value		$	5,744,603			510,060			5,189,804			7,409

December 31, 2017						Fair Value Measurements Using
($ in thousands)		Assets Measured at Fair Value				Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1)1			Significant Other Observable Inputs (Level 2)1			Significant Unobservable Inputs  (Level 3)
Description
Measured on a recurring basis:
AFS fixed income securities:
U.S. government and government agencies		$	49,740			24,652			25,088			—
Foreign government		18,555				—			18,555			—
Obligations of states and political subdivisions		1,582,970				—			1,582,970			—
Corporate securities		1,617,468				—			1,617,468			—
CLO and other ABS		795,458				—			795,458			—
CMBS		383,449				—			376,895			6,554
RMBS		714,882				—			714,882			—
Total AFS fixed income securities		5,162,522				24,652			5,131,316			6,554
AFS equity securities:
Common stock		167,757				138,640			—			5,398
Preferred stock		14,948				14,948			—			—
Total AFS equity securities		182,705				153,588			—			5,398
Total AFS securities		5,345,227				178,240			5,131,316			11,952
Short-term investments		165,555				165,555			—			—
Total assets measured at fair value		$	5,510,782			343,795			5,131,316			11,952

¹There were no transfers of securities between Level 1 and Level 2.

²In accordance with ASU 2015-07, investments amounting to $37.3 million and $23.7 million at December 31, 2018 and December 31, 2017, respectively, were measured at fair value using the net asset value per share (or its practical expedient) and have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to total assets measured at fair value.

Schedule of Expected Benefit Payments

Payments

($ in thousands)		Pension Plan
Benefits Expected to be Paid in Future
Fiscal Years:
2019		$	13,920
2020		13,869
2021		15,026
2022		16,159
2023		17,134
2024-2028		99,197

Retirement Income Plan [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Quantitative Disclosures of our Financial Assets that were Measured at Fair Value

December 31, 2018						Fair Value Measurements at 12/31/18 Using
($ in thousands)		Assets Measured at Fair Value At 12/31/18				Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1)			Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Description
Return seeking assets:
Global equity		$	113,409			113,409			—			—
Private assets1:
Limited partnerships (at net asset value):
Real assets		16,818				—			—			—
Private equity		878				—			—			—
Private credit		262				—			—			—
Hedge fund		7,889				—			—			—
Total limited partnerships		25,847				—			—			—
Other private assets		3,780				—			—			—
Total private assets		29,627				—			—			—
Total return seeking assets		143,036				113,409			—			—
Liability hedging assets:
Fixed income		106,000				106,000			—			—
U.S. Treasury overlay		18,528				18,528			—			—
Total liability hedging assets		124,528				124,528			—			—
Cash and short-term investments:
Short-term investments		62,788				62,788			—			—
Deposit administration contracts		1,482				—			1,482			—
Total cash and short-term investments		64,270				62,788			1,482			—
Total invested assets		$	331,834			300,725			1,482			—

December 31, 2017						Fair Value Measurements at 12/31/17 Using
($ in thousands)		Assets Measured at Fair Value At 12/31/17				Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1)			Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Description
Return seeking assets:
Long-duration fixed income:
Global asset allocation fund		$	41,309			41,309			—			—
Global equity:
Non-U.S. equity		67,989				67,989			—			—
U.S. equity		66,353				66,353			—			—
Total global equity		134,342				134,342			—			—
Private assets (limited partnerships, at net asset value)1:
Real assets		16,305				—			—			—
Private equity		1,096				—			—			—
Private credit		460				—			—			—
Hedge fund		15,192				—			—			—
Total limited partnerships		33,053				—			—			—
Other private assets		980				—			—			980
Total private assets		34,033				—			—			980
Total return seeking assets		209,684				175,651			—			980
Liability hedging assets:
Long-duration fixed income:
Extended duration fixed income		146,837				146,837			—			—
Total liability hedging assets		146,837				146,837			—			—
Cash and short-term investments:
Short-term investments		4,939				4,939			—			—
Deposit administration contracts		1,615				—			1,615			—
Total cash and short-term investments		6,554				4,939			1,615			—
Total invested assets		$	363,075			327,427			1,615			980

¹In accordance with ASU 2015-07, certain investments that are measured at fair value using the net asset value per share (or its practical expedient) have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to total Pension Plan invested assets.

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