CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Assets
Cash and cash equivalents	$ 816,765	$ 271,589	$ 26,031
Restricted cash	434	2,917	491
Accounts and notes receivable
Accounts and notes receivable, gross	699,320	573,241	700,175
Allowance for doubtful accounts	(3,460)	(3,125)	(2,844)
Accounts and notes receivable, net	695,860	570,116	697,331
Inventories
Finished products	383,483	391,666	377,578
Raw materials	33,178	31,318	31,137
Products in process	5,116	5,604	6,332
Operating supplies and other	29,703	29,720	26,376
Inventories	451,480	458,308	441,423
Other current assets	65,571	76,396	89,739
Total current assets	2,030,110	1,379,326	1,255,015
Investments and long-term receivables	43,849	60,709	51,667
Property, plant & equipment
Property, plant & equipment, cost	8,921,990	8,749,217	8,613,500
Allowances for depreciation, depletion & amortization	(4,538,980)	(4,433,179)	(4,322,818)
Property, plant & equipment, net	4,383,010	4,316,038	4,290,682
Operating lease right-of-use assets, net	426,618	408,189	418,896
Goodwill	3,172,112	3,167,061	3,167,061
Other intangible assets, net	1,114,592	1,091,475	1,076,986
Other noncurrent assets	228,433	225,995	220,457
Total assets	11,398,724	10,648,793	10,480,764
Liabilities
Current maturities of long-term debt	500,026	25	24
Short-term debt	0	0	137,000
Trade payables and accruals	278,102	265,159	284,875
Other current liabilities	260,621	270,379	241,689
Total current liabilities	1,038,749	535,563	663,588
Long-term debt	2,785,646	2,784,315	2,781,826
Deferred income taxes, net	671,097	633,039	601,189
Deferred revenue	177,534	179,880	182,666
Operating lease liabilities	405,578	388,042	396,952
Other noncurrent liabilities	555,969	506,097	483,096
Total liabilities	5,634,573	5,026,936	5,109,317
Other commitments and contingencies (Note 8)
Equity
Common stock, $1 par value, Authorized 480,000 shares, Outstanding 132,446, 132,371 and 132,231 shares, respectively	132,446	132,371	132,231
Capital in excess of par value	2,789,801	2,791,353	2,787,002
Retained earnings	3,049,943	2,895,871	2,623,747
Accumulated other comprehensive loss	(208,039)	(197,738)	(171,533)
Total equity	5,764,151	5,621,857	5,371,447
Total liabilities and equity	$ 11,398,724	$ 10,648,793	$ 10,480,764