Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 5,541	$ 6,951
Accounts receivable	26,099	10,729
Inventories	16,593	14,185
Prepaid expenses	1,604	3,154
Total current assets	49,837	35,019
Property, plant and equipment, net	164,193	149,205
Advanced coal royalties	3,113	3,045
Other assets	994	975
Total Assets	218,137	188,244
Current liabilities
Accounts payable	16,325	16,393
Accrued expenses	9,390	8,094
Asset retirement obligations	513	71
Current portion of long-term debt	5,000	5,000
Other liabilities		287
Total current liabilities	31,228	29,845
Asset retirement obligations	12,656	12,707
Long-term debt, net	10,002	4,474
Deferred tax liability	3,537	109
Other long-term liabilities	155
Total liabilities	57,578	47,135
Commitments and contingencies
Stockholders' Equity
Common stock, $0.01 par value, 260,000,000 shares authorized, 40,942,581 and 40,082,467 shares issued and outstanding, respectively	409	401
Additional paid-in capital	152,872	150,926
Retained earnings (deficit)	7,278	(10,218)
Total stockholders' equity	160,559	141,109
Total Liabilities and Stockholders' Equity	$ 218,137	$ 188,244