Condensed Consolidated Statement of Income (Loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue and Other Income:
Revenue	$ 62,538	$ 89,313
Costs and expenses:
Operating costs and expenses	48,469	62,419
DD&A	10,627	11,738
ARO accretion	333	309
Exploration costs	253	280
SG&A	2,978	2,984
Total Interest	5,714	4,619
Total costs and expenses	68,374	82,349
Income (loss) before income taxes	(5,836)	6,964
Income tax benefit
Current	(524)	(229)
Deferred	(1,652)	193
Total income tax benefit	(2,176)	(36)
Net income (loss)	$ (3,660)	$ 7,000
Net income (loss) per share: (Note 13)
Basic and diluted (in Dollars per share)	$ (0.12)	$ 0.23
Weighted average shares outstanding:
Basic and diluted (in Shares)	30,420	30,245
Bank interest	$ 2,654	$ 3,012
Change in interest rate swap valuation	2,593	1,013
Amortization of debt issuance costs	467	543
Other		51
Total non-cash interest	3,060	1,607
Coal Sales [Member]
Revenue and Other Income:
Revenue	61,932	85,235
Other Revenue [Member]
Revenue and Other Income:
Revenue	$ 606	$ 4,078