Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
ASSETS
Cash and cash equivalents	$ 23,569	$ 28,112
Accounts receivable, net
Oil and gas sales	29,119	21,988
Joint interest billing	41,233	31,050
Related party	3,547
Other	1,586	1,740
Advances to operators	3	97
Fair value of derivative instruments	24,962	27,877
Prepaids and other current assets	8,271	9,533
Total current assets	132,290	120,397
PROPERTY AND EQUIPMENT, NET
Proved oil and gas properties, net	1,067,641	907,347
Costs not subject to amortization	406,869	394,429
Other property and equipment, net	10,809	8,738
TOTAL PROPERTY AND EQUIPMENT, NET	1,485,319	1,310,514
DEFERRED FINANCING COSTS, NET	22,385	23,217
INVESTMENT	2,523	2,523
FAIR VALUE OF DERIVATIVE INSTRUMENTS	5,781	9,617
DEFERRED INCOME TAXES	49,664	59,755
OTHER ASSETS	1,567	1,657
TOTAL ASSETS	1,699,529	1,527,680
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable, trade	65,786	25,672
Revenue and royalties payable	63,186	54,600
Current taxes payable	1,048	1,048
Accrued drilling costs	77,166	92,179
Accrued interest	25,539	12,059
Other accrued liabilities	24,374	21,414
Advances for joint operations	25,644	54,179
Deferred income taxes	3,612	9,685
Other current liabilities	1,097	484
Total current liabilities	287,452	271,320
LONG-TERM DEBT, NET OF DEBT DISCOUNT	870,331	729,300
ASSET RETIREMENT OBLIGATIONS	11,412	11,242
FAIR VALUE OF DERIVATIVE INSTRUMENTS	332	9
OTHER LIABILITIES	6,916	5,954
COMMITMENTS AND CONTINGENCIES
SHAREHOLDERS' EQUITY
Common stock, $0.01 par value (90,000 shares authorized, 39,578 and 39,563 shares issued and outstanding at March 31, 2012 and December 31, 2011, respectively)	397	395
Additional paid-in capital	651,234	647,429
Accumulated deficit	(128,545)	(137,969)
Total shareholders' equity	523,086	509,855
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 1,699,529	$ 1,527,680