CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018
Operating Activities
Net income including noncontrolling interest		$ 196,011	$ 213,772	[1],[2]
Adjustments to reconcile net income to net cash provided by continuing operations activities:
(Income) loss from discontinued operations		(74,264)	(148,376)	[1],[2]
Depreciation, depletion and amortization		493,708	373,494	[1],[2]
Previously suspended exploration costs (credits)		12,901	(8)	[1]
Amortization of undeveloped leases		15,150	22,774	[1]
Accretion of asset retirement obligations		19,237	12,768	[1],[2]
Deferred income tax charge (benefit)		18,001	(148,653)	[1]
Pretax (gain) loss from sale of assets		(12)	118	[1]
Mark to market and revaluation of contingent consideration		28,890	0
Mark to market of crude contracts	[1]	(50,831)	27,088
Long-term non-cash compensation		44,755	29,010	[1]
Net (increase) decrease in noncash operating working capital		(5,366)	22,498	[1]
Other operating activities, net		(42,749)	(72,804)	[1]
Net cash provided by continuing operations activities		655,431	331,681	[1]
Investing Activities
Acquisition of oil and gas properties		(1,226,261)	0
Property additions and dry hole costs		(645,169)	(565,237)	[1]
Proceeds from sales of property, plant and equipment	[1]	16,816	621
Net cash required by investing activities		(1,854,614)	(564,616)	[1]
Financing Activities
Borrowings on revolving credit facility		1,075,000	0
Proceeds from term loan		500,000	0
Repurchase of common stock		(299,924)	0
Capital lease obligation payments		(335)	0
Withholding tax on stock-based incentive awards		(6,991)	(6,922)	[1]
Distribution to noncontrolling interest		(68,776)	0
Cash dividends paid		(85,503)	(86,517)	[1]
Net cash provided (required) by financing activities		1,113,471	(93,439)	[1]
Cash Flows from Discontinued Operations 2
Operating activities		122,272	290,849	[1]
Investing activities		(49,798)	(49,910)	[1]
Financing activities		(4,914)	(4,648)	[1]
Net cash provided by discontinued operations		67,560	236,291	[1]
Cash transferred from discontinued operations to continuing operations		48,565	464,258	[1]
Effect of exchange rate changes on cash and cash equivalents		3,268	24,382	[1]
Net increase (decrease) in cash and cash equivalents		(33,879)	162,266	[1]
Cash and cash equivalents at beginning of period		359,923	630,433	[1]
Cash and cash equivalents at end of period		$ 326,044	$ 792,699	[1]

[1] Reclassified to conform to current presentation (See Note A).

[2] Reclassified to conform to current presentation (see Note A).