CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010
Current assets:
Cash and cash equivalents	$ 107,768	$ 222,074	$ 65,792
Receivables, net	566,366	583,743	502,454
Inventories	277,327	252,897	260,163
Deferred income taxes	33,732	32,890	17,755
Commodity derivative instruments	14,234	15,123	24,932
Prepayments and other current assets	71,604	60,441	98,203
Total current assets	1,071,031	1,167,168	969,299
Investments	116,368	103,661	142,212
Property, plant and equipment	7,394,616	7,218,503	7,085,632
Less accumulated depreciation, depletion and amortization	3,236,417	3,103,323	3,000,663
Net property, plant and equipment	4,158,199	4,115,180	4,084,969
Deferred charges and other assets:
Goodwill	634,931	634,633	634,654
Other intangible assets, net	23,337	25,271	26,199
Other	253,515	257,636	255,473
Total deferred charges and other assets	911,783	917,540	916,326
Total assets	6,257,381	6,303,549	6,112,806
Current liabilities:
Short-term borrowings	0	20,000	3,700
Long-term debt due within one year	62,571	72,797	72,551
Accounts payable	304,049	301,132	266,069
Taxes payable	45,065	56,186	39,976
Dividends payable	30,850	30,773	29,802
Accrued compensation	37,978	40,121	35,989
Commodity derivative instruments	18,686	24,428	20,160
Other accrued liabilities	224,220	222,639	172,446
Total current liabilities	723,419	768,076	640,693
Long-term debt	1,369,534	1,433,955	1,508,714
Deferred credits and other liabilities:
Deferred income taxes	727,562	672,269	627,256
Other liabilities	711,516	736,447	708,403
Total deferred credits and other liabilities	1,439,078	1,408,716	1,335,659
Stockholders' equity :
Preferred stocks	15,000	15,000	15,000
Common stockholders' equity:
Shares issued -- $1.00 par value, 189,332,485 at June 30, 2011, 188,672,532 at June 30, 2010 and 188,901,379 at December 31, 2010	189,332	188,901	188,673
Other paid-in capital	1,033,366	1,026,349	1,020,206
Retained earnings	1,523,546	1,497,439	1,407,950
Accumulated other comprehensive loss	(32,268)	(31,261)	(463)
Treasury stock at cost - 538,921 shares	(3,626)	(3,626)	(3,626)
Total common stockholders' equity	2,710,350	2,677,802	2,612,740
Total stockholders' equity	2,725,350	2,692,802	2,627,740
Total liabilities and stockholders' equity	$ 6,257,381	$ 6,303,549	$ 6,112,806