CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 255	$ 252
Accounts receivable, less allowance for doubtful accounts of $2,496 and $2,374	151,407	167,495
Unrealized derivatives	55,993	137,552
Deferred tax asset	2,179
Inventory and other	12,898	22,315
Total current assets	222,732	327,614
Unrealized derivatives	18,074	15,715
Equity method investments	127,236	132,449
Natural gas and oil properties, successful efforts method	8,667,682	8,111,775
Accumulated depletion and depreciation	(2,160,378)	(2,015,591)
Natural gas and oil properties, successful efforts method, net	6,507,304	6,096,184
Transportation and field assets	117,566	117,717
Accumulated depreciation and amortization	(82,652)	(76,150)
Transportation and field assets, net	34,914	41,567
Other assets	120,370	115,206
Total assets	7,030,630	6,728,735
Current liabilities:
Accounts payable	251,635	234,651
Asset retirement obligations	2,366	2,470
Accrued liabilities	159,697	139,379
Deferred tax liability		37,924
Accrued interest	31,914	36,248
Unrealized derivatives	7,971	4,471
Total current liabilities	453,583	455,143
Bank debt	427,000	739,000
Subordinated notes	2,640,170	2,139,185
Deferred tax liability	759,556	698,302
Unrealized derivatives	103	3,463
Deferred compensation liability	207,404	187,604
Asset retirement obligations and other liabilities	151,813	148,646
Total liabilities	4,639,629	4,371,343
Commitments and contingencies
Stockholders’ Equity
Preferred stock, $1 par, 10,000,000 shares authorized, none issued and outstanding
Common stock, $0.01 par, 475,000,000 shares authorized, 163,418,445 issued at September 30, 2013 and 162,641,896 issued at December 31, 2012	1,634	1,626
Common stock held in treasury, 101,301 shares at September 30, 2013 and 127,798 shares at December 31, 2012	(3,751)	(4,760)
Additional paid-in capital	1,944,437	1,915,627
Retained earnings	428,948	360,990
Accumulated other comprehensive income	19,733	83,909
Total stockholders’ equity	2,391,001	2,357,392
Total liabilities and stockholders’ equity	$ 7,030,630	$ 6,728,735