Consolidated Statement of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Revenue:
Coal sales		$ 66,787	$ 62,555
Other income (Note 7)		77	998
Total revenue		66,864	63,553
Costs and expenses:
Operating costs and expenses		46,640	39,692
DD&A		10,829	9,703
ARO accretion		282	207
Coal exploration costs		217	139
SG&A		3,890	2,658
Interest	[1]	2,708	3,091
Total costs and expenses		64,566	55,490
Income before income taxes		2,298	8,063
Less income taxes:
Current		(203)	17
Deferred		369	632
Total income taxes		166	649
Net income	[2]	$ 2,132	$ 7,414
Net income per share(Note 6):
Basic and diluted (in Dollars per share)		$ 0.07	$ 0.25
Weighted average shares outstanding:
Basic and diluted (in Shares)		29,955	29,413
Net change in the estimated fair value of interest rate swap		$ (158)	$ (420)

[1] Included in interest expense is the change in the estimated fair value of our interest rate swaps. Such amounts were $(158) and $(420) for 2018 and 2017, respectively.

[2] There is no material difference between net income and comprehensive income.