Consolidated Statement of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue:
Coal sales		$ 79,055	$ 73,896	$ 202,764	$ 199,280
Other		667	572	1,065	3,053
Total revenue		79,722	74,468	203,829	202,333
Costs and expenses:
Operating costs and expenses		60,230	54,354	145,744	138,125
DD&A		10,815	9,729	32,764	28,533
ARO accretion		293	219	866	640
Exploration costs		279	152	811	566
SG&A		2,519	2,859	8,883	12,095
Interest	[1]	3,261	3,229	10,284	9,662
Total costs and expenses		77,397	70,542	199,352	189,621
Income before income taxes		2,325	3,926	4,477	12,712
Income tax expense (benefit):
Current		(204)	(2,532)	(426)	(1,158)
Deferred		(385)	2,542	(120)	2,151
Total income tax expense (benefit)		(589)	10	(546)	993
Net income	[2]	$ 2,914	$ 3,916	$ 5,023	$ 11,719
Net income per share (Note 9):
Basic and diluted (in Dollars per share)		$ 0.09	$ 0.13	$ 0.16	$ 0.38
Weighted average shares outstanding:
Basic and diluted (in Shares)		30,177	29,774	30,038	29,603
Net change in the estimated fair value of interest rate swap		$ (708)	$ (36)	$ 136	$ (476)

[1] Interest expense for the nine months ended September 30, 2018 and 2017 includes $136 and $(476), respectively, for the net change in the estimated fair value of our interest rate swaps. Such amounts were $(708) and $(36) for the three months ended September 30, 2018 and 2017, respectively.

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