CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets
Cash and cash equivalents	$ 1,197,068	$ 271,589
Restricted cash	945	2,917
Accounts and notes receivable
Customers, less allowance for doubtful accounts 2020 — $2,551; 2019 — $3,125	512,945	532,012
Other	43,352	38,104
Inventories	448,585	458,308
Other current assets	74,270	76,396
Total current assets	2,277,165	1,379,326
Investments and long-term receivables	34,301	60,709
Property, plant & equipment, net	4,425,999	4,316,038
Operating lease right-of-use assets, net	423,128	408,189
Goodwill	3,172,112	3,167,061
Other intangible assets, net	1,123,544	1,091,475
Other noncurrent assets	230,656	225,995
Total assets	11,686,905	10,648,793
Liabilities
Current maturities of long-term debt	515,435	25
Trade payables and accruals	273,080	265,159
Accrued salaries, wages and management incentives	91,646	97,228
Accrued interest	19,943	19,167
Other current liabilities	147,779	153,984
Total current liabilities	1,047,883	535,563
Long-term debt	2,772,240	2,784,315
Deferred income taxes, net	706,050	633,039
Deferred management incentive and other compensation	26,787	22,856
Pension benefits	107,195	142,363
Other postretirement benefits	29,412	35,848
Asset retirement obligations	283,163	210,323
Deferred revenue	174,045	179,880
Operating lease liabilities	399,582	388,042
Other noncurrent liabilities	113,218	94,707
Total liabilities	5,659,575	5,026,936
Other commitments and contingencies (Note 12)
Equity
Common stock, $1 par value, Authorized 480,000 shares, Outstanding 132,516 and 132,371 shares, respectively	132,516	132,371
Capital in excess of par value	2,802,012	2,791,353
Retained earnings	3,274,107	2,895,871
Accumulated other comprehensive loss	(181,305)	(197,738)
Total equity	6,027,330	5,621,857
Total liabilities and equity	$ 11,686,905	$ 10,648,793