Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Operating activities:
Net income (loss)	$ 278,570		$ (754)		$ 213,026
Income (loss) from discontinued operations, net of tax	(312)	[1]	13,567	[1]	(12,926)	[1]
Income (loss) from continuing operations	278,882		(14,321)		225,952
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	386,856		359,205		343,395
Earnings (loss), net of distributions, from equity method investments	2,281		(618)		(2,111)
Deferred income taxes	86,778		(7,503)		118,925
Unrealized (gain) loss on commodity derivatives	6,267		624		(1,827)
Write-downs of oil and natural gas properties (Note 1)	0		391,800		0
Changes in current assets and liabilities, net of acquisitions:
Receivables	(40,669)		(13,416)		(30,452)
Inventories	30,452		(42,334)		(24,226)
Other current assets	(9,474)		297		7,729
Accounts payable	15,084		6,352		(12,263)
Other current liabilities	29,392		(59,001)		33,738
Other noncurrent changes	(43,937)		(33,665)		(31,538)
Net cash provided by continuing operations	741,912		587,420		627,322
Net cash provided by (used in) discontinued operations	281		(2,680)		(674)
Net cash provided by operating activities	742,193		584,740		626,648
Investing activities:
Capital expenditures	(909,400)		(872,920)		(497,000)
Acquisitions, net of cash acquired	0		(67,261)		(157)
Net proceeds from sale or disposition of property and other	124,541		40,110		40,107
Investments	302		9,725		(10,302)
Proceeds from sale of equity method investments	1,896		2,394		2,807
Net cash used in continuing operations	(782,661)		(887,952)		(464,545)
Net cash provided by discontinued operations	0		0		0
Net cash used in investing activities	(782,661)		(887,952)		(464,545)
Financing activities:
Issuance of short-term borrowings	9,500		20,100		0
Repayment of short-term borrowings	0		0		(20,000)
Issuance of long-term debt	507,924		467,957		300
Repayment of long-term debt	(423,707)		(138,775)		(85,151)
Proceeds from issuance of common stock	14,554		88		5,744
Dividends paid	(98,405)		(159,768)		(123,323)
Excess tax benefit on stock-based compensation	0		26		1,239
Contribution from noncontrolling interest	27,000		0		0
Net cash provided by (used in) continuing operations	36,866		189,628		(221,191)
Net cash provided by discontinued operations	0		0		0
Net cash provided by (used in) financing activities	36,866		189,628		(221,191)
Effect of exchange rate changes on cash and cash equivalents	(215)		(146)		(214)
Decrease in cash and cash equivalents	(3,817)		(113,730)		(59,302)
Cash and cash equivalents - beginning of year	49,042		162,772		222,074
Cash and cash equivalents - end of year	$ 45,225		$ 49,042		$ 162,772

[1] Reflected in the Other category.