CONDENSED BALANCE SHEETS - Successor - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 155,792	$ 150,045
Short-term investments	17,501	17,501
Trade accounts receivable	92,551	65,896
Other receivables	4,700	5,901
Inventories, net	75,286	39,420
Prepaid expenses	16,684	12,010
Total current assets	362,514	290,773
Mineral interests, net	134,597	143,231
Property, plant and equipment, net	495,072	496,959
Other long-term assets	18,178	16,668
Total assets	1,010,361	947,631
Current liabilities:
Accounts payable	13,821	6,043
Accrued expenses	61,791	47,339
Other current liabilities	4,622	8,405
Current portion of long-term debt	2,906	2,849
Total current liabilities	83,140	64,636
Long-term debt	2,257	3,725
Deferred income taxes	1,944	1,944
Asset retirement obligations	97,708	96,050
Other long-term liabilities	28,192	28,309
Total liabilities	213,241	194,664
Commitments and contingencies
Stockholders’ Equity:
Common stock, $0.01 par value per share (Authorized-140,000,000 shares, issued and outstanding-53,444,810 and 53,442,532, respectively)	534	533
Preferred stock, $0.01 par value per share (10,000,000 shares authorized, no shares issued and outstanding)	0	0
Additional paid in capital	610,759	802,107
Retained earnings (accumulated deficit)	185,827	(49,673)
Total stockholders’ equity	797,120	752,967
Total liabilities and stockholders’ equity	$ 1,010,361	$ 947,631