Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net income (loss)	$ (513,000)	$ 350,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depletion, depreciation and amortization	1,123,000	1,003,000
Impairment of oil and gas properties	32,000	210,000
Impairment of Inventory and Other Property and Equipment	6,000	21,000
Exploration expenses, including dry holes	41,000	22,000
Deferred income taxes	(340,000)	146,000
Gain on disposition of assets, net	(4,000)	(782,000)
Accretion of discount on asset retirement obligations	14,000	9,000
Discontinued operations	0	(4,000)
Interest expense	11,000	14,000
Derivative related activity	628,000	(22,000)
Amortization of stock-based compensation	66,000	70,000
Other	51,000	13,000
Change in operating assets and liabilities, net of effects from acquisitions and dispositions:
Accounts receivable, net	(64,000)	26,000
Income taxes receivable	17,000	23,000
Inventories	(7,000)	(29,000)
Prepaid expenses	(4,000)	(3,000)
Derivatives	(24,000)	0
Other current assets	1,000	(6,000)
Accounts payable	(8,000)	(266,000)
Interest payable	(26,000)	(4,000)
Income taxes payable	(2,000)	26,000
Other current liabilities	(38,000)	(28,000)
Net cash provided by operating activities	960,000	789,000
Cash flows from investing activities:
Proceeds from disposition of assets, net of cash sold	503,000	556,000
Business acquisition	(429,000)	0
Proceeds from Sale and Maturity of Held-to-maturity Securities	255,000	0
Purchase of investment securities	(2,300,000)	0
Additions to oil and gas properties	(1,387,000)	(1,573,000)
Additions to other assets and other property and equipment, net	(156,000)	(191,000)
Net cash used in investing activities	(3,514,000)	(1,208,000)
Cash flows from financing activities:
Principal payments on long-term debt	(455,000)	0
Proceeds from issuance of common stock, net of issuance costs	2,534,000	0
Distributions to noncontrolling interests	0	(1,000)
Exercise of long-term incentive plan stock options and employee stock purchases	7,000	6,000
Purchases of treasury stock	(24,000)	(31,000)
Tax (provision) benefits related to stock-based compensation	(1,000)	10,000
Payments of financing fees	0	(3,000)
Dividends paid	(7,000)	(6,000)
Net cash provided by (used in) financing activities	2,054,000	(25,000)
Net increase (decrease) in cash and cash equivalents	(500,000)	(444,000)
Cash and cash equivalents, beginning of period	1,391,000	1,025,000
Cash and cash equivalents, end of period	$ 891,000	$ 581,000