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

12 Months Ended

Dec. 31, 2020

Notes Tables

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

		*Pension Benefits*								*Other Postretirement Benefits*
		*at December 31, 2020*								*at December 31, 2019*
		*2020*				*2019*				*2020*				*2019*
Change in benefit obligation:
Benefit obligation at beginning of period		$	720,098			$	644,142			$	464,329			$	473,591
Service cost			1,183				3,950				—				—
Interest cost			20,176				25,101				12,795				18,320
Actuarial loss (gain)			84,663				95,078				(38,455	)			4,761
Benefits and other payments			(47,252	)			(48,173	)			(24,959	)			(32,343	)
Benefit obligation at end of period		$	778,868			$	720,098			$	413,710			$	464,329

Change in plan assets:
Fair value of plan assets at beginning of period		$	668,481			$	578,347			$	—			$	—
Actual return on plan assets			118,403				136,976				—				—
Company contributions			1,346				1,331				24,959				32,343
Benefits and other payments			(47,252	)			(48,173	)			(24,959	)			(32,343	)
Fair value of plan assets at end of period		$	740,978			$	668,481			$	—			$	—

Funded status:
Current liabilities		$	(2,531	)		$	(1,687	)		$	(26,073	)		$	(31,833	)
Noncurrent liabilities			(35,359	)			(49,930	)			(387,637	)			(432,496	)
Net obligation recognized		$	(37,890	)		$	(51,617	)		$	(413,710	)		$	(464,329	)

Amounts recognized in accumulated other comprehensive loss consist of:
Net actuarial loss		$	256,988			$	255,830			$	132,203			$	179,937
Prior service credit			—				—				(18,544	)			(20,949	)
Net amount recognized (before tax effect)		$	256,988			$	255,830			$	113,659			$	158,988

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,*
		*2020*				*2019*				*2018*				*2020*				*2019*				*2018*
Components of net periodic benefit (credit) cost:
Service cost		$	1,183			$	3,950			$	1,150			$	—			$	—			$	—
Interest cost			20,176				25,101				23,505				12,795				18,320				18,706
Expected return on plan assets			(41,821	)			(40,457	)			(40,370	)			—				—				—
Amortization of prior service credits			—				(367	)			(502	)			(2,405	)			(2,405	)			(2,405	)
Recognized net actuarial loss			6,922				5,958				8,715				9,277				9,262				16,205
Net periodic benefit (credit) cost		$	(13,540	)		$	(5,815	)		$	(7,502	)		$	19,667			$	25,177			$	32,506

Schedule of Expected Benefit Payments [Table Text Block]

						*Other*
		*Pension*				*Postretirement*
		*Benefits*				*Benefits*
2021		$	44,391			$	26,073
2022		$	43,639			$	25,250
2023		$	43,112			$	24,455
2024		$	42,755			$	23,581
2025		$	41,291			$	23,249
Year 2026-2030		$	196,850			$	110,456

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,*
		*2020*				*2019*				*2020*				*2019*
Change in benefit obligation:
Benefit obligation at beginning of period		$	214,473			$	177,188			$	71,480			$	70,986
State administrative fees and insurance bond premiums			—				—				1,996				2,157
Service cost			4,603				3,791				6,276				5,685
Interest cost			6,206				7,001				1,844				2,585
Actuarial loss			29,510				39,827				1,897				1,536
Benefits paid			(12,869	)			(13,334	)			(10,052	)			(11,469	)
Benefit obligation at end of period		$	241,923			$	214,473			$	73,441			$	71,480

Funded status:
Current assets		$	—			$	—			$	602			$	1,037
Current liabilities			(12,203	)			(12,331	)			(9,653	)			(11,323	)
Noncurrent liabilities			(229,720	)			(202,142	)			(64,390	)			(61,194	)
Net obligation recognized		$	(241,923	)		$	(214,473	)		$	(73,441	)		$	(71,480	)

Amounts recognized in accumulated other comprehensive loss consist of:
Net actuarial loss (gain)		$	71,259			$	47,352			$	(8,866	)		$	(11,250	)
Net amount recognized (before tax effect)		$	71,259			$	47,352			$	(8,866	)		$	(11,250	)

Schedule of Net Benefit Costs [Table Text Block]

		*CWP*												*Workers’ Compensation*
		*For the Years Ended*												*For the Years Ended*
		*December 31,*												*December 31,*
		*2020*				*2019*				*2018*				*2020*				*2019*				*2018*
Service cost		$	4,603			$	3,791			$	6,650			$	6,276			$	5,685			$	6,230
Interest cost			6,206				7,001				5,245				1,844				2,585				2,283
Recognized net actuarial loss (gain)			5,604				1,016				(853	)			(488	)			(774	)			(79	)
State administrative fees and insurance bond premiums			—				—				—				1,996				2,157				2,671
Net periodic benefit cost		$	16,413			$	11,808			$	11,042			$	9,628			$	9,653			$	11,105

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,*
		*2020*				*2019*				*2018*				*2020*				*2019*				*2018*
Benefit obligations			2.53	%			3.41	%			4.42	%			2.35	%			3.25	%			4.26	%
Net periodic benefit costs			3.41	%			4.42	%			3.75	%			3.25	%			4.26	%			3.57	%

Schedule of Expected Benefit Payments [Table Text Block]

						*Workers' Compensation*
		*CWP*				*Total*				*Actuarial*				*Other*
		*Benefits*				*Benefits*				*Benefits*				*Benefits*
2021		$	12,203			$	10,580			$	9,051			$	1,529
2022		$	11,923			$	10,392			$	8,824			$	1,568
2023		$	11,762			$	10,212			$	8,605			$	1,607
2024		$	11,439			$	10,151			$	8,504			$	1,647
2025		$	11,304			$	10,015			$	8,327			$	1,688
Year 2026-2030		$	57,386			$	50,445			$	41,350			$	9,095