Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
CURRENT ASSETS
Cash and cash equivalents	$ 114,056	$ 184,405
Accounts receivable	25,485	27,476
Assets held for sale	184	21,971
Other current assets	4,981	35,532
Total current assets	144,706	269,384
Oil and natural gas properties, successful efforts method:
Unproved properties	684,383	720,159
Proved oil and gas properties, net	263,069	265,838
Other property and equipment, net	7,423	7,971
Total property and equipment, net	954,875	993,968
OTHER NONCURRENT ASSETS
Other assets	1,009	2,520
Deferred taxes		540
TOTAL ASSETS	1,100,590	1,266,412
CURRENT LIABILITIES
Accounts payable	34,753	34,717
Accrued capital expenditures	7,880	10,956
Accrued liabilities	21,781	25,462
Accrued interest payable	20,919	23,809
Liabilities held for sale		18,898
Total current liabilities	85,333	113,842
NONCURRENT LIABILITIES
Debt, net of unamortized discount and debt issuance costs	490,990	527,248
Asset retirement obligations	3,639	3,401
Other liabilities	10,409	1,367
Total liabilities	590,371	645,858
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, 223,091,686 and 222,674,270 shares issued and outstanding, respectively	2,232	2,227
Additional paid in capital	1,832,501	1,829,082
Treasury stock, shares at cost; 72,590 at June 30, 2016	(61)
Accumulated deficit	(1,324,453)	(1,210,755)
Total stockholders' equity	510,219	620,554
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 1,100,590	$ 1,266,412