Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Assets
Cash and cash equivalents	$ 86,979	$ 275,478	$ 158,301
Accounts and notes receivable
Accounts and notes receivable, gross	410,021	303,178	397,506
Less: Allowance for doubtful accounts	(5,339)	(6,198)	(7,375)
Accounts and notes receivable, net	404,682	296,980	390,131
Inventories
Finished products	266,489	262,886	266,265
Raw materials	29,863	27,758	24,457
Products in process	5,415	5,963	3,974
Operating supplies and other	38,720	38,415	39,910
Inventories	340,487	335,022	334,606
Current deferred income taxes	39,275	40,696	43,357
Prepaid expenses	27,300	21,713	24,840
Assets held for sale	12,926	15,083	0
Total current assets	911,649	984,972	951,235
Investments and long-term receivables	43,194	42,081	28,506
Property, plant & equipment
Property, plant & equipment, cost	6,730,505	6,666,617	6,697,685
Reserve for depreciation, depletion & amortization	(3,519,862)	(3,507,432)	(3,419,174)
Property, plant & equipment, net	3,210,643	3,159,185	3,278,511
Goodwill	3,086,219	3,086,716	3,086,716
Other intangible assets, net	698,471	692,532	694,972
Other noncurrent assets	170,048	161,113	140,135
Total assets	8,120,224	8,126,599	8,180,075
Liabilities
Current maturities of long-term debt	161	150,602	285,152
Short-term debt	100,000	0	0
Trade payables and accruals	128,142	113,337	171,834
Other current liabilities	163,466	171,671	159,481
Liabilities of assets held for sale	0	801	0
Total current liabilities	391,769	436,411	616,467
Long-term debt	2,524,420	2,526,401	2,528,387
Noncurrent deferred income taxes	664,967	657,367	687,337
Deferred revenue	73,068	73,583	0
Other noncurrent liabilities	652,480	671,775	604,948
Total liabilities	4,306,704	4,365,537	4,437,139
Other commitments and contingencies (Note 8)
Equity
Common stock, $1 par value, Authorized 480,000 shares, Issued 129,963, 129,721 and 129,383 shares, respectively	129,963	129,721	129,393
Capital in excess of par value	2,592,239	2,580,209	2,560,824
Retained earnings	1,247,984	1,276,649	1,261,501
Accumulated other comprehensive loss	(156,666)	(225,517)	(208,782)
Total equity	3,813,520	3,761,062	3,742,936
Total liabilities and equity	$ 8,120,224	$ 8,126,599	$ 8,180,075