CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Assets
Cash and cash equivalents	$ 120,041	$ 271,589	$ 30,838
Restricted cash	232	2,917	270
Accounts and notes receivable
Accounts and notes receivable, gross	601,182	573,241	563,084
Allowance for doubtful accounts	(3,517)	(3,125)	(2,554)
Accounts and notes receivable, net	597,665	570,116	560,530
Inventories
Finished products	403,612	391,666	369,743
Raw materials	33,676	31,318	27,951
Products in process	5,010	5,604	4,976
Operating supplies and other	28,449	29,720	26,727
Inventories	470,747	458,308	429,397
Other current assets	88,095	76,396	62,816
Total current assets	1,276,780	1,379,326	1,083,851
Investments and long-term receivables	57,987	60,709	50,952
Property, plant & equipment
Property, plant & equipment, cost	8,907,788	8,749,217	8,559,549
Allowances for depreciation, depletion & amortization	(4,506,700)	(4,433,179)	(4,284,211)
Property, plant & equipment, net	4,401,088	4,316,038	4,275,338
Operating lease right-of-use assets, net	420,930	408,189	426,381
Goodwill	3,167,061	3,167,061	3,161,842
Other intangible assets, net	1,083,515	1,091,475	1,085,398
Other noncurrent assets	222,021	225,995	213,090
Total assets	10,629,382	10,648,793	10,296,852
Liabilities
Current maturities of long-term debt	25	25	24
Short-term debt	0	0	178,500
Trade payables and accruals	243,019	265,159	248,119
Other current liabilities	232,632	270,379	232,964
Total current liabilities	475,676	535,563	659,607
Long-term debt	2,785,566	2,784,315	2,780,589
Deferred income taxes, net	648,405	633,039	568,229
Deferred revenue	178,568	179,880	184,744
Operating lease liabilities	399,489	388,042	403,426
Other noncurrent liabilities	551,352	506,097	483,048
Total liabilities	5,039,056	5,026,936	5,079,643
Other commitments and contingencies (Note 8)
Equity
Common stock, $1 par value, Authorized 480,000 shares, Outstanding 132,433, 132,371 and 132,069 shares, respectively	132,433	132,371	132,069
Capital in excess of par value	2,782,738	2,791,353	2,789,864
Retained earnings	2,885,084	2,895,871	2,467,201
Accumulated other comprehensive loss	(209,929)	(197,738)	(171,925)
Total equity	5,590,326	5,621,857	5,217,209
Total liabilities and equity	$ 10,629,382	$ 10,648,793	$ 10,296,852