Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 62,420	$ 157,439
Accounts receivable, net	123,754	111,195
Deferred income taxes	5,722	4,201
Other current assets	5,957	6,926
Total current assets	197,853	279,761
Oil and gas properties, full cost method
Proved properties, net	1,530,946	1,408,484
Unproved properties, not being amortized	399,166	377,437
Other property and equipment, net	8,081	8,294
Total property and equipment, net	1,938,193	1,794,215
Debt issuance costs	22,093	22,899
Other assets	10,925	13,885
Total Assets	2,169,064	2,110,760
Current liabilities
Accounts payable	47,049	57,146
Revenues and royalties payable	87,278	79,136
Accrued capital expenditures	108,483	87,031
Accrued interest	24,787	17,430
Advances for joint operations	7,977	19,967
Liabilities of discontinued operations	9,533	10,936
Derivative liabilities	21,382	9,947
Other current liabilities	56,659	41,242
Total current liabilities	363,148	322,835
Long-term debt	900,425	900,247
Liabilities of discontinued operations	17,060	17,336
Deferred income taxes	22,019	16,856
Asset retirement obligations	7,156	6,576
Other liabilities	6,026	5,306
Liabilities	1,315,834	1,269,156
Commitments and contingencies
Shareholders’ equity
Common stock, $0.01 par value, 90,000,000 shares authorized; 45,480,154 issued and outstanding as of March 31, 2014 and 45,468,675 issued and outstanding as of December 31, 2013	455	455
Additional paid-in capital	885,598	879,948
Accumulated deficit	(32,823)	(38,799)
Total shareholders’ equity	853,230	841,604
Total Liabilities and Shareholders’ Equity	$ 2,169,064	$ 2,110,760