CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Assets
Cash and cash equivalents	$ 38,026	$ 141,646	$ 701,163
Restricted cash	5,043	5,000	0
Accounts and notes receivable
Accounts and notes receivable, gross	648,009	590,986	582,105
Less: Allowance for doubtful accounts	(2,294)	(2,649)	(2,903)
Accounts and notes receivable, net	645,715	588,337	579,202
Inventories
Finished products	346,940	327,711	307,046
Raw materials	29,078	27,152	27,852
Products in process	2,668	1,827	1,652
Operating supplies and other	29,966	27,648	29,276
Inventories	408,652	384,338	365,826
Other current assets	78,476	60,780	100,781
Total current assets	1,175,912	1,180,101	1,746,972
Investments and long-term receivables	42,944	35,115	35,999
Property, plant & equipment
Property, plant & equipment, cost	8,386,315	7,969,312	7,539,928
Allowances for depreciation, depletion & amortization	(4,197,592)	(4,050,381)	(4,002,227)
Property, plant & equipment, net	4,188,723	3,918,931	3,537,701
Goodwill	3,169,615	3,122,321	3,101,337
Other intangible assets, net	1,099,354	1,063,630	835,269
Other noncurrent assets	199,087	184,793	182,056
Total assets	9,875,635	9,504,891	9,439,334
Liabilities
Current maturities of long-term debt	23	41,383	4,827
Short-term debt	200,000	0	0
Trade payables and accruals	233,885	197,335	181,207
Other current liabilities	256,507	204,154	227,665
Total current liabilities	690,415	442,872	413,699
Long-term debt	2,778,129	2,813,482	2,809,966
Deferred income taxes, net	581,026	464,081	716,165
Deferred revenue	186,829	191,476	193,117
Other noncurrent liabilities	493,447	624,087	621,253
Total liabilities	4,729,846	4,535,998	4,754,200
Other commitments and contingencies (Note 8)
Equity
Common stock, $1 par value, Authorized 480,000 shares, Outstanding 132,045, 132,324 and 132,281 shares, respectively	132,045	132,324	132,281
Capital in excess of par value	2,795,366	2,805,587	2,803,106
Retained earnings	2,361,903	2,180,448	1,886,006
Accumulated other comprehensive loss	(143,525)	(149,466)	(136,259)
Total equity	5,145,789	4,968,893	4,685,134
Total liabilities and equity	$ 9,875,635	$ 9,504,891	$ 9,439,334