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Note 16- Coal Workers' Pneumoconiosis and Workers' Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Schedule of Changes in Accumulated Postemployment Benefit Obligations [Table Text Block]

		*Pension Benefits*								*Other Postretirement Benefits*
		*at December 31,*								*at December 31,*
		*2021*				*2020*				*2021*				*2020*
Change in benefit obligation:
Benefit obligation at beginning of period		$	778,868			$	720,098			$	413,710			$	464,329
Service cost			1,114				1,183				—				—
Interest cost			14,230				20,176				7,274				12,795
Actuarial (gain) loss			(25,073	)			84,663				(42,836	)			(38,455	)
Plan settlement			(719	)			—				—				—
Benefits and other payments			(45,414	)			(47,252	)			(24,851	)			(24,959	)
Benefit obligation at end of period		$	723,006			$	778,868			$	353,297			$	413,710

Change in plan assets:
Fair value of plan assets at beginning of period		$	740,978			$	668,481			$	—			$	—
Actual return on plan assets			36,867				118,403				—				—
Company contributions			2,254				1,346				24,851				24,959
Benefits and other payments			(45,414	)			(47,252	)			(24,851	)			(24,959	)
Plan settlement			(719	)			—				—				—
Fair value of plan assets at end of period		$	733,966			$	740,978			$	—			$	—

Funded status:
Noncurrent assets		$	38,947			$	—			$	—			$	—
Current liabilities			(1,974	)			(2,531	)			(23,638	)			(26,073	)
Noncurrent liabilities			(26,013	)			(35,359	)			(329,659	)			(387,637	)
Net asset (obligation) recognized		$	10,960			$	(37,890	)		$	(353,297	)		$	(413,710	)

Amounts recognized in accumulated other comprehensive loss consist of:
Net actuarial loss		$	231,726			$	256,988			$	82,851			$	132,203
Prior service credit			—				—				(16,138	)			(18,544	)
Net amount recognized (before tax effect)		$	231,726			$	256,988			$	66,713			$	113,659

Schedule of Net Benefit Costs [Table Text Block]

		*Pension Benefits*												*Other Postretirement Benefits*
		*For the Years Ended December 31,*												*For the Years Ended December 31,*
		*2021*				*2020*				*2019*				*2021*				*2020*				*2019*
Components of net periodic benefit (credit) cost:
Service cost		$	1,114			$	1,183			$	3,950			$	—			$	—			$	—
Interest cost			14,230				20,176				25,101				7,274				12,795				18,320
Expected return on plan assets			(42,168	)			(41,821	)			(40,457	)			—				—				—
Amortization of prior service credits			—				—				(367	)			(2,405	)			(2,405	)			(2,405	)
Recognized net actuarial loss			5,469				6,922				5,958				6,516				9,277				9,262
Settlement loss recognized			22				—				—				—				—				—
Net periodic benefit (credit) cost		$	(21,333	)		$	(13,540	)		$	(5,815	)		$	11,385			$	19,667			$	25,177

Schedule of Expected Benefit Payments [Table Text Block]

						*Other*
		*Pension*				*Postretirement*
		*Benefits*				*Benefits*
2022		$	43,826			$	23,638
2023		$	44,331			$	22,893
2024		$	42,723			$	22,063
2025		$	41,253			$	21,810
2026		$	42,622			$	21,460
Year 2027-2031		$	193,244			$	101,663

Coal Workers Pneumoconiosis and Workers' Compensation [Member]

Notes Tables

Schedule of Changes in Accumulated Postemployment Benefit Obligations [Table Text Block]

		*CWP*								*Workers' Compensation*
		*at December 31,*								*at December 31,*
		*2021*				*2020*				*2021*				*2020*
Change in benefit obligation:
Benefit obligation at beginning of period		$	241,923			$	214,473			$	73,441			$	71,480
State administrative fees and insurance bond premiums			—				—				1,778				1,996
Service cost			4,460				4,603				4,236				6,276
Interest cost			4,710				6,206				1,127				1,844
Actuarial (gain) loss			(22,256	)			29,510				(2,039	)			1,897
Benefits paid			(12,966	)			(12,869	)			(11,282	)			(10,052	)
Benefit obligation at end of period		$	215,871			$	241,923			$	67,261			$	73,441

Funded status:
Current assets		$	—			$	—			$	1,092			$	602
Current liabilities			(12,398	)			(12,203	)			(10,205	)			(9,653	)
Noncurrent liabilities			(203,473	)			(229,720	)			(58,148	)			(64,390	)
Net obligation recognized		$	(215,871	)		$	(241,923	)		$	(67,261	)		$	(73,441	)

Amounts recognized in accumulated other comprehensive loss consist of:
Net actuarial loss (gain)		$	40,638			$	71,259			$	(10,726	)		$	(8,866	)
Net amount recognized (before tax effect)		$	40,638			$	71,259			$	(10,726	)		$	(8,866	)

Schedule of Net Benefit Costs [Table Text Block]

		*CWP*												*Workers’ Compensation*
		*For the Years Ended*												*For the Years Ended*
		*December 31,*												*December 31,*
		*2021*				*2020*				*2019*				*2021*				*2020*				*2019*
Service cost		$	4,460			$	4,603			$	3,791			$	4,236			$	6,276			$	5,685
Interest cost			4,710				6,206				7,001				1,127				1,844				2,585
Recognized net actuarial loss (gain)			8,364				5,604				1,016				(179	)			(488	)			(774	)
State administrative fees and insurance bond premiums			—				—				—				1,778				1,996				2,157
Net periodic benefit cost		$	17,534			$	16,413			$	11,808			$	6,962			$	9,628			$	9,653

Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]

		*CWP*												*Workers' Compensation*
		*For the Years Ended*												*For the Years Ended*
		*December 31,*												*December 31,*
		*2021*				*2020*				*2019*				*2021*				*2020*				*2019*
Benefit obligations			2.85	%			2.53	%			3.41	%			2.74	%			2.35	%			3.25	%
Net periodic benefit costs			2.53	%			3.41	%			4.42	%			2.35	%			3.25	%			4.26	%

Schedule of Expected Benefit Payments [Table Text Block]

						*Workers' Compensation*
		*CWP*				*Total*				*Actuarial*				*Other*
		*Benefits*				*Benefits*				*Benefits*				*Benefits*
2022		$	12,398			$	11,504			$	9,113			$	2,391
2023		$	12,119			$	11,395			$	8,944			$	2,451
2024		$	11,917			$	11,371			$	8,859			$	2,512
2025		$	11,603			$	11,443			$	8,868			$	2,575
2026		$	11,395			$	11,525			$	8,886			$	2,639
Year 2027-2031		$	56,278			$	58,808			$	44,589			$	14,219