Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
CURRENT ASSETS
Cash and cash equivalents	$ 160,458	$ 201,229
Accounts receivable	33,823	44,423
Assets held for sale	468	468
Other current assets	3,352	4,295
Total current assets	198,101	250,415
Oil and natural gas properties, successful efforts method:
Unproved properties	513,314	526,270
Proved oil and gas properties, net	476,676	414,482
Other property and equipment, net	6,433	6,748
Total property and equipment, net	996,423	947,500
OTHER NONCURRENT ASSETS
Other assets	5,766	729
TOTAL ASSETS	1,200,290	1,198,644
CURRENT LIABILITIES
Accounts payable	51,472	44,049
Accrued capital expenditures	14,769	11,083
Accrued liabilities	38,864	55,044
Accrued interest payable	9,823	21,098
Liabilities held for sale	245	245
Total current liabilities	115,173	131,519
NONCURRENT LIABILITIES
Debt, net of unamortized discount and debt issuance costs	492,964	492,278
Asset retirement obligations	5,054	4,806
Other liabilities	3,270	13,434
Total liabilities	616,461	642,037
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, 262,239,978 and 260,591,893 shares issued and outstanding, respectively	2,631	2,607
Additional paid in capital	1,960,788	1,958,731
Treasury stock, shares at cost; 837,635 and 72,704 shares, respectively	(1,767)	(61)
Accumulated deficit	(1,377,823)	(1,404,670)
Total stockholders' equity	583,829	556,607
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 1,200,290	$ 1,198,644