Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
CURRENT ASSETS
Cash and cash equivalents	$ 12,049	$ 17,224
Accounts receivable	112,166	77,609
Assets held for sale		206
Other current assets	7,263	12,023
Total current assets	131,478	107,062
Oil and natural gas properties, successful efforts method:
Unproved properties	547,963	459,549
Proved oil and gas properties, net	716,292	647,881
Other property and equipment, net	6,949	6,942
Total property and equipment, net	1,271,204	1,114,372
OTHER NONCURRENT ASSETS
Other assets	3,117	2,093
TOTAL ASSETS	1,405,799	1,223,527
CURRENT LIABILITIES
Accounts payable	111,230	76,174
Accrued capital expenditures	13,689	10,658
Accrued liabilities	49,326	41,662
Accrued interest payable	21,891	21,100
Total current liabilities	196,136	149,594
NONCURRENT LIABILITIES
Debt, net of unamortized discount and debt issuance costs	496,397	495,021
Credit facility	60,000
Asset retirement obligations	6,554	6,029
Other liabilities	3,348	529
Total liabilities	762,435	651,173
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY
Preferred stock, 50,000,000 authorized, no shares issued and outstanding	0	0
Common stock, $0.01 par value, 1,000,000,000 authorized, 302,325,028 and 262,740,355 shares issued and outstanding, respectively	3,040	2,637
Additional paid in capital	2,061,365	1,967,958
Treasury stock, shares at cost; 1,661,915 and 992,315 shares, respectively	(3,236)	(2,096)
Accumulated deficit	(1,417,805)	(1,396,145)
Total stockholders' equity	643,364	572,354
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 1,405,799	$ 1,223,527