Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 8,622	$ 157,439
Accounts receivable, net	134,492	111,195
Deferred income taxes	15,235	4,201
Other current assets	4,363	6,926
Total current assets	162,712	279,761
Oil and gas properties, full cost method
Proved properties, net	1,675,941	1,408,484
Unproved properties, not being amortized	458,393	377,437
Other property and equipment, net	7,767	8,294
Total property and equipment, net	2,142,101	1,794,215
Debt issuance costs	21,604	22,899
Other assets	4,011	13,885
Total Assets	2,330,428	2,110,760
Current liabilities
Accounts payable	75,364	57,146
Revenues and royalties payable	83,531	79,136
Accrued capital expenditures	87,318	87,031
Accrued interest	17,462	17,430
Advances for joint operations	5,349	19,967
Liabilities of discontinued operations	8,550	10,936
Derivative liabilities	39,455	9,947
Other current liabilities	59,035	41,242
Total current liabilities	376,064	322,835
Long-term debt	1,021,606	900,247
Liabilities of discontinued operations	16,491	17,336
Deferred income taxes	27,365	16,856
Asset retirement obligations	9,365	6,576
Other liabilities	9,624	5,306
Liabilities	1,460,515	1,269,156
Commitments and contingencies
Shareholders’ equity
Common stock, $0.01 par value, 90,000,000 shares authorized; 46,018,977 issued and outstanding as of June 30, 2014 and 45,468,675 issued and outstanding as of December 31, 2013	460	455
Additional paid-in capital	899,957	879,948
Accumulated deficit	(30,504)	(38,799)
Total shareholders’ equity	869,913	841,604
Total Liabilities and Shareholders’ Equity	$ 2,330,428	$ 2,110,760