CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 246	$ 348
Accounts receivable, less allowance for doubtful accounts of $2,487 and $2,494	221,304	179,667
Derivative assets	80	4,421
Deferred tax asset	40,362	51,414
Inventory and other	17,353	12,451
Total current assets	279,345	248,301
Derivative assets	15,917	9,233
Equity method investments	123,791	129,034
Natural gas and oil properties, successful efforts method	9,309,743	9,032,881
Accumulated depletion and depreciation	(2,397,089)	(2,274,444)
Natural gas and oil properties, successful efforts method, net	6,912,654	6,758,437
Transportation and field assets	120,036	118,625
Accumulated depreciation and amortization	(87,955)	(85,841)
Transportation and field assets, net	32,081	32,784
Other assets	118,987	121,297
Total assets	7,482,775	7,299,086
Current liabilities:
Accounts payable	273,756	258,431
Asset retirement obligations	5,037	5,037
Accrued liabilities	164,585	161,520
Accrued interest	32,303	44,375
Derivative liabilities	72,854	26,198
Total current liabilities	548,535	495,561
Bank debt	594,000	500,000
Subordinated notes	2,640,866	2,640,516
Deferred tax liability	778,955	771,980
Derivative liabilities	142	25
Deferred compensation liability	235,307	247,537
Asset retirement obligations and other liabilities	235,289	229,015
Total liabilities	5,033,094	4,884,634
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, 163,763,190 issued at March 31, 2014 and 163,441,414 issued at December 31, 2013	1,638	1,634
Common stock held in treasury, 93,275 shares at March 31, 2014 and 98,520 shares at December 31, 2013	(3,455)	(3,637)
Additional paid-in capital	1,969,948	1,959,636
Retained earnings	476,554	450,583
Accumulated other comprehensive income	4,996	6,236
Total stockholders’ equity	2,449,681	2,414,452
Total liabilities and stockholders’ equity	$ 7,482,775	$ 7,299,086