Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
CURRENT ASSETS
Cash and cash equivalents	$ 5,959	$ 17,224
Accounts receivable	119,332	77,609
Assets held for sale		206
Other current assets	8,639	12,023
Total current assets	133,930	107,062
Oil and natural gas properties, successful efforts method:
Unproved properties	482,475	459,549
Proved oil and gas properties, net	807,583	647,881
Other property and equipment, net	6,300	6,942
Total property and equipment, net	1,296,358	1,114,372
OTHER NONCURRENT ASSETS
Other assets	3,481	2,093
TOTAL ASSETS	1,433,769	1,223,527
CURRENT LIABILITIES
Accounts payable	116,735	76,174
Accrued capital expenditures	12,979	10,658
Accrued liabilities	56,909	41,662
Accrued interest payable	21,661	21,100
Total current liabilities	208,284	149,594
NONCURRENT LIABILITIES
Debt, net of unamortized discount and debt issuance costs	497,778	495,021
Credit facility	32,500
Asset retirement obligations	7,110	6,029
Other liabilities	611	529
Total liabilities	746,283	651,173
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY
Preferred stock, 50,000,000 authorized, no shares issued and outstanding
Common stock, $0.01 par value, 1,000,000,000 authorized, 20,169,063 and 17,516,024 shares issued and outstanding, respectively	3,043	2,637
Additional paid in capital	2,065,119	1,967,958
Treasury stock, shares at cost; 1,747,624 and 992,315 shares, respectively	(3,357)	(2,096)
Accumulated deficit	(1,377,319)	(1,396,145)
Total stockholders' equity	687,486	572,354
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 1,433,769	$ 1,223,527