Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 24,381	$ 28,482
Receivables:
Crude oil and natural gas sales	552,476	643,498
Affiliated parties	13,360	13,107
Joint interest and other, net	567,476	349,579
Derivative assets	52,423	3,616
Inventories	102,179	54,440
Deferred and prepaid taxes	63,266	44,337
Prepaid expenses and other	14,040	10,207
Total current assets	1,389,601	1,147,266
Net property and equipment, based on successful efforts method of accounting	13,635,852	10,721,272
Net debt issuance costs and other	87,625	72,644
Noncurrent derivative assets	31,992	0
Total assets	15,145,070	11,941,182
Current liabilities:
Accounts payable trade	1,263,724	885,289
Revenues and royalties payable	272,755	291,772
Payables to affiliated parties	7,305	5,436
Accrued liabilities and other	404,506	198,113
Derivative liabilities	1,645	90,535
Current portion of long-term debt	2,078	2,011
Total current liabilities	1,952,013	1,473,156
Long-term debt, net of current portion	5,995,837	4,713,821
Other noncurrent liabilities:
Deferred income tax liabilities	2,141,447	1,736,812
Asset retirement obligations, net of current portion	75,462	54,353
Noncurrent derivative liabilities	3,109	7,829
Other noncurrent liabilities	9,358	2,093
Total other noncurrent liabilities	2,229,376	1,801,087
Commitments and contingencies (Note 10)
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; 372,005,502 shares issued and outstanding at December 31, 2014; 371,317,318 shares issued and outstanding at December 31, 2013	3,720	3,713
Additional paid-in capital	1,287,941	1,250,178
Accumulated Other Comprehensive Income (Loss), Net of Tax	(385)	0
Retained earnings	3,676,568	2,699,227
Total shareholders’ equity	4,967,844	3,953,118
Total liabilities and shareholders’ equity	$ 15,145,070	$ 11,941,182