Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Assets
Cash and cash equivalents	$ 188,081	$ 275,478	$ 191,172
Accounts and notes receivable
Accounts and notes receivable, gross	328,202	303,178	325,383
Less: Allowance for doubtful accounts	(6,030)	(6,198)	(7,207)
Accounts and notes receivable, net	322,172	296,980	318,176
Inventories
Finished products	267,783	262,886	271,634
Raw materials	27,148	27,758	23,819
Products in process	6,168	5,963	5,077
Operating supplies and other	39,475	38,415	40,803
Inventories	340,574	335,022	341,333
Current deferred income taxes	38,844	40,696	43,394
Prepaid expenses	24,762	21,713	24,574
Assets held for sale	12,929	15,083	0
Total current assets	927,362	984,972	918,649
Investments and long-term receivables	41,707	42,081	29,172
Property, plant & equipment
Property, plant & equipment, cost	6,668,630	6,666,617	6,698,952
Reserve for depreciation, depletion & amortization	(3,507,394)	(3,507,432)	(3,349,258)
Property, plant & equipment, net	3,161,236	3,159,185	3,349,694
Goodwill	3,095,801	3,086,716	3,086,716
Other intangible assets, net	691,840	692,532	695,852
Other noncurrent assets	160,529	161,113	135,956
Total assets	8,078,475	8,126,599	8,216,039
Liabilities
Current maturities of long-term debt	140,604	150,602	144,706
Trade payables and accruals	116,677	113,337	125,101
Other current liabilities	212,572	171,671	211,286
Liabilities of assets held for sale	0	801	0
Total current liabilities	469,853	436,411	481,093
Long-term debt	2,525,420	2,526,401	2,669,752
Noncurrent deferred income taxes	614,405	657,367	704,166
Deferred revenue	73,392	73,583	0
Other noncurrent liabilities	680,476	671,775	615,421
Total liabilities	4,363,546	4,365,537	4,470,432
Other commitments and contingencies (Note 8)
Equity
Common stock, $1 par value	129,952	129,721	129,389
Capital in excess of par value	2,585,696	2,580,209	2,547,959
Retained earnings	1,220,512	1,276,649	1,281,080
Accumulated other comprehensive loss	(221,231)	(225,517)	(212,821)
Total equity	3,714,929	3,761,062	3,745,607
Total liabilities and equity	$ 8,078,475	$ 8,126,599	$ 8,216,039