Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
ASSETS
Cash and cash equivalents	$ 20,769	$ 28,112
Accounts receivable, net
Oil and gas sales	27,235	21,988
Joint interest billing	55,059	31,050
Related party	1,463	0
Other	2,659	1,740
Advances to operators	528	97
Fair value of derivative instruments	34,829	27,877
Prepaids and other current assets	5,605	9,533
Total current assets	148,147	120,397
PROPERTY AND EQUIPMENT, NET
Proved oil and gas properties, net	961,605	842,041
Unproved properties and significant development projects, not being amortized	491,098	459,735
Other property and equipment, net	11,444	8,738
TOTAL PROPERTY AND EQUIPMENT, NET	1,464,147	1,310,514
DEFERRED FINANCING COSTS, NET	21,345	23,217
INVESTMENT	2,523	2,523
FAIR VALUE OF DERIVATIVE INSTRUMENTS	24,441	9,617
DEFERRED INCOME TAXES	42,340	59,755
OTHER ASSETS	1,699	1,657
TOTAL ASSETS	1,704,642	1,527,680
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable, trade	73,393	25,672
Revenue and royalties payable	75,355	54,600
Current taxes payable	460	1,048
Accrued drilling costs	77,333	92,179
Accrued interest	11,891	12,059
Other accrued liabilities	25,133	21,414
Advances for joint operations	20,837	54,179
Current maturities of long-term debt	16,650	0
Deferred income taxes	11,098	9,685
Other current liabilities	2,552	484
Total current liabilities	314,702	271,320
LONG-TERM DEBT, NET OF CURRENT MATURITIES AND DEBT DISCOUNT	816,478	729,300
ASSET RETIREMENT OBLIGATIONS	11,563	11,242
FAIR VALUE OF DERIVATIVE INSTRUMENTS	103	9
OTHER LIABILITIES	4,496	5,954
COMMITMENTS AND CONTINGENCIES
SHAREHOLDERS' EQUITY
Common stock, $0.01 par value (90,000 shares authorized, 39,978 and 39,563 shares issued and outstanding at June 30, 2012 and December 31, 2011, respectively)	400	395
Additional paid-in capital	656,942	647,429
Accumulated deficit	(100,042)	(137,969)
Total shareholders' equity	557,300	509,855
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 1,704,642	$ 1,527,680