Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014		Mar. 31, 2014
Current assets:
Cash and cash equivalents	$ 122,241		$ 81,855		$ 83,700
Receivables, net	564,090		693,318		690,761
Inventories	336,598		300,811		301,332
Deferred income taxes	32,987		23,806		29,427
Commodity derivative instruments	7,127		18,335		81
Prepayments and other current assets	98,503		76,848		99,229
Total current assets	1,161,546		1,194,973		1,204,530
Investments	118,407		117,920		113,763
Property, plant and equipment	9,299,713		9,693,171		9,150,269
Less accumulated depreciation, depletion and amortization	4,233,193		4,166,407		3,954,442
Net property, plant and equipment	5,066,520		5,526,764		5,195,827
Deferred charges and other assets:
Goodwill	635,204	[1]	635,204	[1]	636,039	[1]
Other intangible assets, net	9,166		9,840		12,296
Other	326,542		325,277		246,394
Total deferred charges and other assets	970,912		970,321		894,729
Total assets	7,317,385		7,809,978		7,408,849
Current liabilities:
Short-term borrowings	16,100		0		0
Long-term debt due within one year	409,292		269,449		12,227
Accounts payable	259,881		382,671		399,935
Taxes payable	48,436		45,631		61,847
Dividends payable	35,687		35,607		33,980
Accrued compensation	37,797		62,775		40,016
Commodity derivative instruments	0		0		12,186
Other accrued liabilities	179,672		172,561		185,287
Total current liabilities	986,865		968,694		745,478
Long-term debt	1,780,694		1,825,278		2,093,605
Deferred credits and other liabilities:
Deferred income taxes	804,757		952,413		899,420
Other liabilities	810,626		813,809		720,542
Total deferred credits and other liabilities	1,615,383		1,766,222		1,619,962
Equity:
Preferred stocks	15,000		15,000		15,000
Common stockholders' equity:
Authorized - 500,000,000 shares, $1.00 par value. Shares issued - 195,191,129 at March 31, 2015,191,838,720 at March 31, 2014 and 194,754,812 at December 31, 2014	195,191		194,755		191,839
Other paid-in-capital	1,214,867		1,207,188		1,110,221
Retained earnings	1,421,220		1,762,827		1,625,692
Accumulated other comprehensive loss	(40,924)		(42,103)		(37,538)
Treasury stock at cost - 538,921 shares	(3,626)		(3,626)		(3,626)
Total common stockholders' equity	2,786,728		3,119,041		2,886,588
Total stockholders' equity	2,801,728		3,134,041		2,901,588
Noncontrolling interest	132,715		115,743		48,216
Total equity	2,934,443		3,249,784		2,949,804
Total liabilities and equity	$ 7,317,385		$ 7,809,978		$ 7,408,849

[1] Balance is presented net of accumulated impairment of $12.3 million at the pipeline and energy services segment, which occurred in prior periods.