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Retirement Plans (Tables)
 12 Months Ended
Dec. 31, 2020
Retirement Benefits [Abstract]  
Change in Benefit Obligation
The funded status and amounts recognized in the 2020 and 2019 consolidated balance sheets, as measured on December 31, 2020 and 2019, respectively, for the RAP and Postretirement Plan were as follows:
 RAPPostretirement
Plan		RAPPostretirement
Plan
($ in Thousands)2020202020192019
Change in Fair Value of Plan Assets
Fair value of plan assets at beginning of year$442,034 $— $390,564 $— 
Actual return on plan assets58,802 — 67,377 — 
Employer contributions— 210 — 270 
Gross benefits paid(21,987)(210)(15,907)(270)
Fair value of plan assets at end of year(a)
$478,849 $— $442,034 $— 
Change in Benefit Obligation
Net benefit obligation at beginning of year$260,576 $2,545 $233,658 $2,523 
Service cost8,244 — 7,263 — 
Interest cost8,185 78 9,752 104 
Actuarial (gain) loss24,998 (169)25,810 188 
Gross benefits paid(21,987)(210)(15,907)(270)
Net benefit obligation at end of year(a)
$280,017 $2,243 $260,576 $2,545 
Funded (unfunded) status$198,832 $(2,243)$181,458 $(2,545)
Noncurrent assets$198,832 $— $181,458 $— 
Current liabilities— (189)— (214)
Noncurrent liabilities— (2,055)— (2,330)
Asset (liability) recognized on the consolidated balance sheets$198,832 $(2,243)$181,458 $(2,545)
(a) The fair value of the plan assets represented 171% and 170% of the net benefit obligation of the pension plan at December 31, 2020 and 2019, respectively.
AOCI Components
Amounts recognized in accumulated other comprehensive (income) loss, net of tax, as of December 31, 2020 and 2019 were as follows:
RAPPostretirement
Plan		RAPPostretirement
Plan
($ in Thousands)2020202020192019
Prior service cost$(194)$(477)$(249)$(533)
Net actuarial loss28,029 — 37,075 126 
Amount not yet recognized in net periodic benefit cost, but recognized in accumulated other comprehensive (income) loss$27,835 $(477)$36,827 $(406)
Changes in OCI
Other changes in plan assets and benefit obligations recognized in OCI, net of tax, in 2020 and 2019 were as follows:
RAPPostretirement
Plan		RAPPostretirement
Plan
($ in Thousands)2020202020192019
Net actuarial gain (loss)$8,209 $169 $17,235 $(188)
Amortization of prior service cost(73)(75)(73)(75)
Amortization of actuarial loss (gain) 3,897 — 480 (4)
Income tax (expense) benefit(3,040)(23)(4,532)67 
Total Recognized in OCI$8,993 $71 $13,109 $(200)
Net period benefit cost for the pension plans
The components of net pension cost for the RAP for 2020, 2019, and 2018 were as follows:
($ in Thousands)202020192018
Service cost$8,244 $7,263 $7,540 
Interest cost8,185 9,752 9,125 
Expected return on plan assets(25,595)(24,332)(23,195)
Amortization of prior service cost(73)(73)(73)
Amortization of actuarial loss (gain)3,897 480 2,195 
Recognized settlement loss (gain)— — 809 
Total net periodic pension cost (income)$(5,342)$(6,910)$(3,600)
Net period benefit cost for postretirement plan
The components of net periodic benefit cost for the Postretirement Plan for 2020, 2019, and 2018 were as follows:
($ in Thousands)202020192018
Interest cost$78 $104 $108 
Amortization of prior service cost(75)(75)(75)
Amortization of actuarial loss (gain)— (4)8 
Total net periodic benefit cost$3 $25 $41 
Weighted Average Benefit Assumptions
RAPPostretirement
Plan		RAPPostretirement
Plan
2020202020192019
Weighted average assumptions used to determine benefit obligations
Discount rate2.40 %2.40 %3.20 %3.20 %
Rate of increase in compensation levels2.00 %N/A2.00 %N/A
Weighted average assumptions used to determine net periodic benefit costs
Discount rate
3.20 %3.20 %4.30 %4.30 %
Rate of increase in compensation levels2.00 %N/A3.00 %N/A
Expected long-term rate of return on plan assets
6.20 %N/A6.00 %N/A
Plan Asset Allocation Percentages The asset allocation for the RAP as of the December 31, 2020 and 2019 measurement dates, respectively, by asset category were as follows:
Asset Category20202019
Equity securities53 %51 %
Fixed-income securities33 %33 %
Group annuity contracts11 %11 %
Alternative securities1 %3 %
Other2 %2 %
Total100 %100 %
Pension Plan Investments
Based on these inputs, the following table summarizes the fair value of the RAP’s investments as of December 31, 2020 and 2019:
  Fair Value Measurements Using
($ in Thousands)December 31, 2020Level 1Level 2Level 3
RAP Investments
Money market account$9,429 $9,429 $— $— 
Common /collective trust funds172,950 172,950 — — 
Mutual funds245,605 245,605 — — 
Group annuity contracts50,866 — — 50,866 
Total RAP Investments$478,849 $427,983 $— $50,866 
 Fair Value Measurements Using
($ in Thousands)December 31, 2019Level 1Level 2Level 3
RAP Investments
Money market account$8,903 $8,903 $— $— 
Common /collective trust funds155,964 155,964 — — 
Mutual funds227,112 227,112 — — 
Group annuity contracts50,055 — — 50,055 
Total RAP Investments$442,034 $391,979 $— $50,055 
Schedule of Changes in Fair Value of Plan Assets
The following presents a summary of the changes in the fair value of the RAP's Level 3 asset during the periods indicated.
Fair Value Reconciliation of Level 3 RAP Investments20202019
Fair value of group annuity contract at beginning of period$50,055 $47,265 
Return on plan assets3,499 5,495 
Benefits paid(2,688)(2,704)
Fair value of group annuity contract at end of period$50,866 $50,055 
Expected Benefit Payments
The projected benefit payments were calculated using the same assumptions as those used to calculate the benefit obligations listed above. The projected benefit payments for the RAP and Postretirement Plan at December 31, 2020, reflecting expected future services, were as follows:
($ in Thousands)RAPPostretirement Plan
Estimated future benefit payments
2021$19,332 $191 
202220,043 186 
202319,785 181 
202420,304 175 
202521,766 168 
2026-203091,228 732 
One Percentage Point Change in Assumed Health Care Cost
A one percentage point change in the assumed health care cost trend rate would have the following effect:
 20202019
($ in Thousands)100 bp Increase100 bp Decrease100 bp Increase100 bp Decrease
Effect on total of service and interest cost$5 $(4)$7 $(6)
Effect on postretirement benefit obligation$141 $(124)$170 $(148)