Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
CURRENT ASSETS
Cash and cash equivalents	$ 28,795	$ 201,229
Accounts receivable	40,553	44,423
Assets held for sale	426	468
Other current assets	6,959	4,295
Total current assets	76,733	250,415
Oil and natural gas properties, successful efforts method:
Unproved properties	488,260	526,270
Proved oil and gas properties, net	636,023	414,482
Other property and equipment, net	7,190	6,748
Total property and equipment, net	1,131,473	947,500
OTHER NONCURRENT ASSETS
Other assets	2,040	729
TOTAL ASSETS	1,210,246	1,198,644
CURRENT LIABILITIES
Accounts payable	69,914	44,049
Accrued capital expenditures	19,319	11,083
Accrued liabilities	24,981	55,044
Accrued interest payable	9,973	21,098
Liabilities held for sale	189	245
Total current liabilities	124,376	131,519
NONCURRENT LIABILITIES
Debt, net of unamortized discount and debt issuance costs	494,332	492,278
Asset retirement obligations	5,766	4,806
Other liabilities	2,740	13,434
Total liabilities	627,214	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, 262,740,355 and 260,591,893 shares issued and outstanding, respectively	2,637	2,607
Additional paid in capital	1,965,514	1,958,731
Treasury stock, shares at cost; 992,315 and 72,704 shares, respectively	(2,096)	(61)
Accumulated deficit	(1,383,023)	(1,404,670)
Total stockholders' equity	583,032	556,607
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 1,210,246	$ 1,198,644