Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
CURRENT ASSETS
Cash and cash equivalents	$ 21,801	$ 17,224
Accounts receivable	113,208	77,609
Assets held for sale		206
Other current assets	8,350	12,023
Total current assets	143,359	107,062
Oil and natural gas properties, successful efforts method:
Unproved properties	537,958	459,549
Proved oil and gas properties, net	694,599	647,881
Other property and equipment, net	6,785	6,942
Total property and equipment, net	1,239,342	1,114,372
OTHER NONCURRENT ASSETS
Other assets	5,617	2,093
TOTAL ASSETS	1,388,318	1,223,527
CURRENT LIABILITIES
Accounts payable	96,048	76,174
Accrued capital expenditures	12,689	10,658
Accrued liabilities	39,423	41,662
Accrued interest payable	10,433	21,100
Total current liabilities	158,593	149,594
NONCURRENT LIABILITIES
Debt, net of unamortized discount and debt issuance costs	495,707	495,021
Credit facility	65,000
Asset retirement obligations	6,269	6,029
Other liabilities	2,100	529
Total liabilities	727,669	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, 301,771,111 and 262,740,355 shares issued and outstanding, respectively	3,033	2,637
Additional paid in capital	2,059,418	1,967,958
Treasury stock, shares at cost; 1,499,566 and 992,315 shares, respectively	(3,031)	(2,096)
Accumulated deficit	(1,398,771)	(1,396,145)
Total stockholders' equity	660,649	572,354
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 1,388,318	$ 1,223,527