Associate Benefit Plans - Schedule of Net Periodic Benefit Cost Components of Postretirement Benefits (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Change in benefit obligation:
Benefit obligation at beginning of year	$ 2,170	$ 2,288	$ 2,170	$ 1,893
Service cost		67	61	54
Interest cost		54	67	78
Actuarial (loss) gain		(216)	80	229
Benefits paid		(55)	(90)	(84)
Benefit obligation at end of year		2,138	2,288	2,170
Change in plan assets:
Fair value of plan assets at beginning of year	0	0	0	0
Employer contributions		55	90	84
Benefits paid		(55)	(90)	(84)
Fair value of plan assets at end of year		0	0	0
Unfunded status		(2,138)	(2,288)	(2,170)
Amounts recognized in accumulated other comprehensive income:
Net prior service credit		359	435	511
Net gain (loss)		607	376	491
Net amount recognized		966	811	1,002
Components of net periodic cost (benefit):
Service cost		67	61	54
Interest cost		54	67	78
Amortization of prior service cost		(76)	(76)	(76)
Net loss (gain) recognition		(20)	(36)	(63)
Net periodic cost (benefit)		$ 25	$ 16	$ (7)
Assumption used to determine net periodic benefit cost:
Discount rate for net periodic benefit cost		2.40%	3.20%	4.20%
Assumption used to value the Accumulated Postretirement Benefit Obligation (APBO):
Discount rate for disclosure obligations		2.70%	2.40%	3.10%
Pension Benefits
Assumption used to determine net periodic benefit cost:
Discount rate for net periodic benefit cost		2.50%	2.91%
Assumption used to value the Accumulated Postretirement Benefit Obligation (APBO):
Discount rate for disclosure obligations		2.82%	3.25%
Beneficial | Pension Benefits
Change in benefit obligation:
Benefit obligation at beginning of year	102,878	$ 112,283	$ 102,878
Service cost		0	0
Interest cost		2,100	2,910
Plan participants' contributions		0	0
Amendments		(83)	0
Actuarial (loss) gain		(4,420)	11,499
Benefits paid		(5,185)	(5,004)
Benefit obligation at end of year		104,695	112,283	$ 102,878
Change in plan assets:
Fair value of plan assets at beginning of year	100,388	111,129	100,388
Actual return on plan assets		2,734	15,985
Employer contributions		308	340
Participants' contributions		0	0
Settlements		(83)	0
Benefits paid		(5,185)	(5,004)
Administrative expenses		(661)	(580)
Fair value of plan assets at end of year		108,242	111,129	100,388
Unfunded status		3,547	(1,154)
Amounts recognized in accumulated other comprehensive income:
Net gain (loss)		(6,882)	(6,635)
Components of net periodic cost (benefit):
Service cost		0	0
Interest cost		2,100	2,910
Expected return on plan assets		(6,783)	(6,363)
Net loss (gain) recognition		27	4
Net periodic cost (benefit)		(4,656)	(3,449)
Beneficial | Other Postretirement Benefits
Change in benefit obligation:
Benefit obligation at beginning of year	20,263	19,302	20,263
Service cost		39	48
Interest cost		309	475
Plan participants' contributions		68	35
Amendments		0	(202)
Actuarial (loss) gain		(442)	(520)
Benefits paid		(1,171)	(797)
Benefit obligation at end of year		18,105	19,302	20,263
Change in plan assets:
Fair value of plan assets at beginning of year	0	0	0
Actual return on plan assets		0	0
Employer contributions		1,103	762
Participants' contributions		68	35
Settlements		0	0
Benefits paid		(1,171)	(797)
Administrative expenses		0	0
Fair value of plan assets at end of year		0	0	0
Unfunded status		(18,105)	(19,302)
Amounts recognized in accumulated other comprehensive income:
Net gain (loss)		(87)	(517)
Components of net periodic cost (benefit):
Service cost		39	48
Interest cost		309	475
Expected return on plan assets		0	0
Net loss (gain) recognition		(11)	(205)
Net periodic cost (benefit)		$ 337	$ 318
Assumption used to determine net periodic benefit cost:
Discount rate for net periodic benefit cost		2.32%	3.12%
Assumption used to value the Accumulated Postretirement Benefit Obligation (APBO):
Discount rate for disclosure obligations		2.70%	2.31%
Pennsylvania | Alliance
Change in benefit obligation:
Benefit obligation at beginning of year	6,893		$ 6,893	6,289
Service cost	17			40
Interest cost	105			253
Settlements	(7,272)			(282)
Actuarial (loss) gain	274			864
Benefits paid	0			(231)
Benefit obligation at end of year	0			6,893
Change in plan assets:
Fair value of plan assets at beginning of year	7,431		$ 7,431	6,533
Actual return on plan assets	(159)			1,435
Settlements	(7,272)			(273)
Benefits paid	0			(231)
Administrative expenses	0			(33)
Fair value of plan assets at end of year	0			7,431
Unfunded status	0			538
Amounts recognized in accumulated other comprehensive income:
Net gain (loss)	0			(279)
Components of net periodic cost (benefit):
Service cost	17			40
Interest cost	105			253
Expected return on plan assets	(196)			(471)
Settlements	0			16
Plan settlement loss	1,431			0
Net loss (gain) recognition	0			0
Net periodic cost (benefit)	$ 1,357			$ (162)