Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 392,646	$ 229,396
Accounts receivable:
Trade, net	430,732	316,854
Due from affiliates	2,753	3,299
Income taxes receivable	4,784	7,447
Inventories	220,125	197,056
Prepaid expenses	15,852	13,438
Assets held for sale	583,750	0
Other current assets:
Derivatives	75,237	279,119
Other	2,555	3,746
Total current assets	1,728,434	1,050,355
Oil and gas properties, using the successful efforts method of accounting:
Proved properties	13,406,135	14,259,708
Unproved properties	123,382	231,555
Accumulated depletion, depreciation and amortization	(4,903,122)	(4,412,913)
Total property, plant and equipment	8,626,395	10,078,350
Goodwill	274,329	298,142
Other property and equipment, net	1,224,153	1,217,694
Other assets:
Investment in unconsolidated affiliate	224,850	204,129
Derivatives	90,854	55,257
Other, net	123,773	165,103
Assets, Total	12,292,788	13,069,030
Accounts payable:
Trade	910,393	729,942
Due to affiliates	150,164	96,935
Interest payable	62,374	68,083
Income taxes payable	165	208
Deferred income taxes	19,169	86,481
Liabilities held for sale	38,562	0
Other current liabilities:
Derivatives	11,626	13,416
Other	57,653	39,725
Total current liabilities	1,250,106	1,034,790
Long-term debt	2,653,059	3,721,193
Derivatives	9,933	12,307
Deferred income taxes	1,472,717	2,140,416
Other liabilities	292,215	293,016
Stockholders' equity:
Common stock, $.01 par value	1,458	1,350
Additional paid-in capital	5,079,821	3,683,934
Treasury stock, at cost	(144,776)	(510,570)
Retained earnings	1,665,081	2,514,640
Total stockholders' equity attributable to common stockholders	6,601,584	5,689,354
Noncontrolling interest in consolidating subsidiaries	13,174	177,954
Total stockholders' equity	6,614,758	5,867,308
Liabilities and Stockholders' Equity, Total	$ 12,292,788	$ 13,069,030