Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 162,772		$ 222,074
Receivables, net	646,251		583,743
Inventories	274,205		252,897
Deferred income taxes	40,407		32,890
Commodity derivative instruments	27,687		15,123
Prepayments and other current assets	43,316		60,441
Total current assets	1,194,638		1,167,168
Investments	109,424		103,661
Property, plant and equipment	7,646,222		7,218,503
Less accumulated depreciation, depletion and amortization	3,361,208		3,103,323
Net property, plant and equipment	4,285,014		4,115,180
Deferred charges and other assets: [Abstract]
Goodwill	634,931	[1]	634,633	[1]
Other intangible assets, net	20,843		25,271
Other	311,275		257,636
Total deferred charges and other assets	967,049		917,540
Total assets	6,556,125		6,303,549
Current liabilities:
Short-term borrowings	0		20,000
Long-term debt due within one year	139,267		72,797
Accounts payable	337,228		301,132
Taxes payable	70,176		56,186
Dividends payable	31,794		30,773
Accrued Compensation	47,804		40,121
Commodity derivative instruments	13,164		24,428
Other accrued liabilities	259,320		222,639
Total current liabilities	898,753		768,076
Long-term Debt, Excluding Current Maturities	1,285,411		1,433,955
Deferred credits and other liabilities:
Deferred income taxes	769,166		672,269
Other liabilities	827,228		736,447
Total deferred credits and other liabilities	1,596,394		1,408,716
Stockholders' equity:
Preferred stocks	15,000		15,000
Common stockholders' equity:
Common stock shares authorized - 500,000,000 - issued - $1.00 par value, 189,332,485 shares at December 31, 2011 and 188,901,379 shares at December 31, 2010	189,332		188,901
Other paid-in capital	1,035,739		1,026,349
Retained earnings	1,586,123		1,497,439
Accumulated other comprehensive loss	(47,001)		(31,261)
Treasury stock at cost - 538,921 shares	(3,626)		(3,626)
Total common stockholders' equity	2,760,567		2,677,802
Total stockholders' equity	2,775,567		2,692,802
Total liabilities and stockholders' equity	$ 6,556,125		$ 6,303,549

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