Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
CURRENT ASSETS
Cash and cash equivalents	$ 71,646	$ 52,095
Accounts receivable, net	102,912	112,821
Accounts receivable - related party	26,050	9,815
Current assets held for sale	0	1,882
Assets of discontinued operations	18,500	0
Fair value of derivative instruments	6,493	23,981
Deferred income taxes	2,061	0
Prepaids and other current assets	3,474	8,111
Total current assets	231,136	208,705
Oil and gas properties using the full cost method of accounting
Proved oil and gas properties, net	1,299,338	1,152,548
Unproved properties, not being amortized	358,272	323,688
Other property and equipment, net	14,115	11,438
TOTAL PROPERTY AND EQUIPMENT, NET	1,671,725	1,487,674
LONG-TERM ASSETS HELD FOR SALE	0	132,626
DEFERRED FINANCING COSTS, NET	22,917	23,914
FAIR VALUE OF DERIVATIVE INSTRUMENTS	6,283	5,180
DEFERRED INCOME TAXES	0	21,272
OTHER ASSETS	5,111	4,625
TOTAL ASSETS	1,937,172	1,883,996
CURRENT LIABILITIES
Accounts payable, trade	75,965	44,775
Revenue and royalties payable	96,964	82,300
Current taxes payable	1,067	765
Accrued drilling costs	55,207	60,729
Accrued interest	25,816	18,012
Other accrued liabilities	33,482	27,680
Advances for joint operations	18,119	8,069
Deferred income taxes	0	7,925
Current liabilities associated with assets held for sale	0	48,663
Liabilities of discontinued operations	14,928	0
Total current liabilities	321,548	298,918
LONG-TERM DEBT, NET OF DEBT DISCOUNT	968,663	967,808
LONG-TERM LIABILITIES ASSOCIATED WITH ASSETS HELD FOR SALE	0	23,547
LIABILITIES OF DISCONTINUED OPERATIONS	15,600	0
ASSET RETIREMENT OBLIGATIONS	5,098	4,489
FAIR VALUE OF DERIVATIVE INSTRUMENTS	993	0
DEFERRED INCOME TAXES	3,563	0
OTHER LIABILITIES	4,908	4,218
COMMITMENTS AND CONTINGENCIES
SHAREHOLDERS’ EQUITY
Common stock, $0.01 par value (90,000 shares authorized, 40,380 and 40,165 shares issued and outstanding at March 31, 2013 and December 31, 2012, respectively)	404	402
Additional paid-in capital	672,695	667,096
Accumulated deficit	(56,300)	(82,482)
Total shareholders’ equity	616,799	585,016
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$ 1,937,172	$ 1,883,996