Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 152,290	$ 28,482
Receivables:
Crude oil and natural gas sales	671,769	643,498
Affiliated parties	15,066	13,107
Joint interest and other, net	507,038	349,579
Derivative assets	143,268	3,616
Inventories	82,564	54,440
Deferred and prepaid taxes	11,393	44,337
Prepaid expenses and other	15,488	10,207
Total current assets	1,598,876	1,147,266
Net property and equipment, based on successful efforts method of accounting	12,993,789	10,721,272
Net debt issuance costs and other	88,420	72,644
Noncurrent derivative assets	31,002	0
Total assets	14,712,087	11,941,182
Current liabilities:
Accounts payable trade	1,201,082	885,289
Revenues and royalties payable	323,277	291,772
Payables to affiliated parties	10,473	5,436
Accrued liabilities and other	267,623	198,113
Derivative liabilities	0	90,535
Current portion of long-term debt	2,062	2,011
Total current liabilities	1,804,517	1,473,156
Long-term debt, net of current portion	5,831,860	4,713,821
Other noncurrent liabilities:
Deferred income tax liabilities	2,155,442	1,736,812
Asset retirement obligations, net of current portion	62,331	54,353
Noncurrent derivative liabilities	0	7,829
Other noncurrent liabilities	9,727	2,093
Total other noncurrent liabilities	2,227,500	1,801,087
Commitments and contingencies (Note 7)
Shareholders’ equity:
Preferred stock, $0.01 par value; 25,000,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $0.01 par value; 500,000,000 shares authorized; 372,046,368 shares issued and outstanding at September 30, 2014; 371,317,318 shares issued and outstanding at December 31, 2013	3,720	3,713
Additional paid-in capital	1,281,970	1,250,178
Retained earnings	3,562,520	2,699,227
Total shareholders’ equity	4,848,210	3,953,118
Total liabilities and shareholders’ equity	$ 14,712,087	$ 11,941,182