CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Assets
Cash and cash equivalents	$ 26,031	$ 40,037	$ 55,059
Restricted cash	491	4,367	6,056
Accounts and notes receivable
Accounts and notes receivable, gross	700,175	542,868	640,742
Allowance for doubtful accounts	(2,844)	(2,090)	(2,628)
Accounts and notes receivable, net	697,331	540,778	638,114
Inventories
Finished products	377,578	372,604	343,948
Raw materials	31,137	27,942	29,684
Products in process	6,332	3,064	1,882
Operating supplies and other	26,376	25,720	28,250
Inventories	441,423	429,330	403,764
Other current assets	89,739	64,633	80,209
Total current assets	1,255,015	1,079,145	1,183,202
Investments and long-term receivables	51,667	44,615	41,989
Property, plant & equipment
Property, plant & equipment, cost	8,613,500	8,457,619	8,241,164
Allowances for depreciation, depletion & amortization	(4,322,818)	(4,220,312)	(4,134,750)
Property, plant & equipment, net	4,290,682	4,237,307	4,106,414
Operating lease right-of-use assets, net	418,896	0	0
Goodwill	3,167,061	3,165,396	3,163,954
Other intangible assets, net	1,076,986	1,095,378	1,156,898
Other noncurrent assets	220,457	210,289	192,327
Total assets	10,480,764	9,832,130	9,844,784
Liabilities
Current maturities of long-term debt	24	23	23
Short-term debt	137,000	133,000	360,000
Trade payables and accruals	284,875	216,473	231,913
Other current liabilities	241,689	253,054	219,860
Total current liabilities	663,588	602,550	811,796
Long-term debt	2,781,826	2,779,357	2,776,906
Deferred income taxes, net	601,189	567,283	545,756
Deferred revenue	182,666	186,397	188,826
Operating lease liabilities	396,952	0	0
Other noncurrent liabilities	483,096	493,640	500,870
Total liabilities	5,109,317	4,629,227	4,824,154
Other commitments and contingencies (Note 8)
Equity
Common stock, $1 par value, Authorized 480,000 shares, Outstanding 132,231, 131,762, and 132,268 shares, respectively	132,231	131,762	132,268
Capital in excess of par value	2,787,002	2,798,486	2,788,486
Retained earnings	2,623,747	2,444,870	2,244,545
Accumulated other comprehensive loss	(171,533)	(172,215)	(144,669)
Total equity	5,371,447	5,202,903	5,020,630
Total liabilities and equity	$ 10,480,764	$ 9,832,130	$ 9,844,784