CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Assets
Cash and cash equivalents	$ 90,411	$ 40,037	$ 38,026
Restricted cash	691	4,367	5,043
Accounts and notes receivable
Accounts and notes receivable, gross	727,900	542,868	648,009
Allowance for doubtful accounts	(2,960)	(2,090)	(2,294)
Accounts and notes receivable, net	724,940	540,778	645,715
Inventories
Finished products	364,164	372,604	346,940
Raw materials	31,250	27,942	29,078
Products in process	6,062	3,064	2,668
Operating supplies and other	28,184	25,720	29,966
Inventories	429,660	429,330	408,652
Other current assets	78,540	64,633	78,476
Total current assets	1,324,242	1,079,145	1,175,912
Investments and long-term receivables	57,059	44,615	42,944
Property, plant & equipment
Property, plant & equipment, cost	8,657,731	8,457,619	8,386,315
Allowances for depreciation, depletion & amortization	(4,370,386)	(4,220,312)	(4,197,592)
Property, plant & equipment, net	4,287,345	4,237,307	4,188,723
Operating lease right-of-use assets, net	410,833	0	0
Goodwill	3,167,061	3,165,396	3,169,615
Other intangible assets, net	1,071,330	1,095,378	1,099,354
Other noncurrent assets	221,803	210,289	199,087
Total assets	10,539,673	9,832,130	9,875,635
Liabilities
Current maturities of long-term debt	24	23	23
Short-term debt	0	133,000	200,000
Trade payables and accruals	265,012	216,473	233,885
Other current liabilities	270,248	253,054	256,507
Total current liabilities	535,284	602,550	690,415
Long-term debt	2,783,068	2,779,357	2,778,129
Deferred income taxes, net	628,726	567,283	581,026
Deferred revenue	180,541	186,397	186,829
Operating lease liabilities	391,079	0	0
Other noncurrent liabilities	478,736	493,640	493,447
Total liabilities	4,997,434	4,629,227	4,729,846
Other commitments and contingencies (Note 8)
Equity
Common stock, $1 par value, Authorized 480,000 shares, Outstanding 132,350, 131,762, and 132,045 shares, respectively	132,350	131,762	132,045
Capital in excess of par value	2,785,245	2,798,486	2,795,366
Retained earnings	2,795,834	2,444,870	2,361,903
Accumulated other comprehensive loss	(171,190)	(172,215)	(143,525)
Total equity	5,542,239	5,202,903	5,145,789
Total liabilities and equity	$ 10,539,673	$ 9,832,130	$ 9,875,635