Associate Benefit Plans - Fair Value Weighted Average Asset Allocations (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	$ 0	$ 0	$ 0	$ 0
Asset allocation percent	100.00%	100.00%
Total
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	$ 108,242	$ 111,129
Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	96,718	111,129
Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	11,524	0
Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	$ 0	$ 0
Large cap
Defined Benefit Plan Disclosure [Line Items]
Asset allocation percent	5.20%	5.20%
Large cap | Total
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	$ 5,610	$ 5,827
Large cap | Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	5,610	5,827
Large cap | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	0	0
Large cap | Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	$ 0	$ 0
Mid cap
Defined Benefit Plan Disclosure [Line Items]
Asset allocation percent	0.10%	0.10%
Mid cap | Total
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	$ 75	$ 69
Mid cap | Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	75	69
Mid cap | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	0	0
Mid cap | Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	$ 0	$ 0
Small cap
Defined Benefit Plan Disclosure [Line Items]
Asset allocation percent	0.10%	0.10%
Small cap | Total
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	$ 59	$ 61
Small cap | Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	59	61
Small cap | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	0	0
Small cap | Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	$ 0	$ 0
International
Defined Benefit Plan Disclosure [Line Items]
Asset allocation percent	9.00%	9.20%
International | Total
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	$ 9,728	$ 10,249
International | Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	9,728	10,249
International | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	0	0
International | Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	$ 0	$ 0
Global Managed Volatility
Defined Benefit Plan Disclosure [Line Items]
Asset allocation percent	8.00%	8.10%
Global Managed Volatility | Total
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	$ 8,640	$ 8,970
Global Managed Volatility | Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	8,640	8,970
Global Managed Volatility | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	0	0
Global Managed Volatility | Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	$ 0	$ 0
U.S. Managed Volatility
Defined Benefit Plan Disclosure [Line Items]
Asset allocation percent	3.00%	3.00%
U.S. Managed Volatility | Total
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	$ 3,243	$ 3,363
U.S. Managed Volatility | Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	3,243	3,363
U.S. Managed Volatility | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	0	0
U.S. Managed Volatility | Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	$ 0	$ 0
Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Asset allocation percent	63.90%	65.80%
Fixed Income | Total
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	$ 69,194	$ 73,071
Fixed Income | Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	69,194	73,071
Fixed Income | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	0	0
Fixed Income | Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	$ 0	$ 0
U.S. Government Agencies
Defined Benefit Plan Disclosure [Line Items]
Asset allocation percent	10.60%	8.40%
U.S. Government Agencies | Total
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	$ 11,524	$ 9,345
U.S. Government Agencies | Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	0	9,345
U.S. Government Agencies | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	11,524	0
U.S. Government Agencies | Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	$ 0	$ 0
Accrued Income
Defined Benefit Plan Disclosure [Line Items]
Asset allocation percent	0.10%	0.10%
Accrued Income | Total
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	$ 169	$ 174
Accrued Income | Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	169	174
Accrued Income | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	0	0
Accrued Income | Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of assets	$ 0	$ 0