CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Assets
Cash and cash equivalents	$ 701,163	$ 258,986	$ 135,365
Restricted cash	0	9,033	0
Accounts and notes receivable
Accounts and notes receivable, gross	582,105	494,634	536,242
Less: Allowance for doubtful accounts	(2,903)	(2,813)	(4,260)
Accounts and notes receivable, net	579,202	491,821	531,982
Inventories
Finished products	307,046	293,619	283,266
Raw materials	27,852	22,648	25,411
Products in process	1,652	1,480	2,753
Operating supplies and other	29,276	27,869	26,612
Inventories	365,826	345,616	338,042
Prepaid expenses	100,781	31,726	71,370
Total current assets	1,746,972	1,137,182	1,076,759
Investments and long-term receivables	35,999	39,226	38,914
Property, plant & equipment
Property, plant & equipment, cost	7,539,928	7,185,818	7,105,036
Allowance for depreciation, depletion & amortization	(4,002,227)	(3,924,380)	(3,876,743)
Property, plant & equipment, net	3,537,701	3,261,438	3,228,293
Goodwill	3,101,337	3,094,824	3,094,824
Other intangible assets, net	835,269	769,052	753,314
Other noncurrent assets	182,056	169,753	165,981
Total assets	9,439,334	8,471,475	8,358,085
Liabilities
Current maturities of long-term debt	4,827	138	131
Trade payables and accruals	181,207	145,042	163,139
Other current liabilities	227,665	227,064	197,642
Total current liabilities	413,699	372,244	360,912
Long-term debt	2,809,966	1,982,751	1,983,639
Deferred income taxes, net	716,165	702,854	706,715
Deferred revenue	193,117	198,388	201,732
Other noncurrent liabilities	621,253	642,762	601,117
Total liabilities	4,754,200	3,898,999	3,854,115
Other commitments and contingencies (Note 8)
Equity
Common stock, $1 par value, Authorized 480,000 shares, Outstanding 132,281, 132,339 and 132,309 shares, respectively	132,281	132,339	132,309
Capital in excess of par value	2,803,106	2,807,995	2,805,355
Retained earnings	1,886,006	1,771,518	1,685,412
Accumulated other comprehensive loss	(136,259)	(139,376)	(119,106)
Total equity	4,685,134	4,572,476	4,503,970
Total liabilities and equity	$ 9,439,334	$ 8,471,475	$ 8,358,085