CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands		Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Assets
Cash and cash equivalents		$ 1,129,799	$ 258,986	$ 91,902
Restricted cash		0	9,033	0
Accounts and notes receivable
Accounts and notes receivable, gross		573,029	494,634	537,127
Less: Allowance for doubtful accounts		(2,943)	(2,813)	(4,332)
Accounts and notes receivable, net		570,086	491,821	532,795
Inventories
Finished products		318,465	293,619	295,405
Raw materials		27,106	22,648	25,366
Products in process		1,210	1,480	2,223
Operating supplies and other		28,148	27,869	24,872
Inventories		374,929	345,616	347,866
Prepaid expenses		109,998	31,726	50,844
Total current assets		2,184,812	1,137,182	1,023,407
Investments and long-term receivables		38,888	39,226	38,924
Property, plant & equipment
Property, plant & equipment, cost		7,531,536	7,185,818	7,052,051
Allowance for depreciation, depletion & amortization		(3,992,728)	(3,924,380)	(3,834,680)
Property, plant & equipment, net		3,538,808	3,261,438	3,217,371
Goodwill		3,101,439	3,094,824	3,094,824
Other intangible assets, net		834,971	769,052	754,341
Other noncurrent assets		171,025	169,753	161,246
Total assets		9,869,943	8,471,475	8,290,113
Liabilities
Current maturities of long-term debt	[1]	525,776	138	131
Trade payables and accruals		202,753	145,042	176,476
Other current liabilities		197,264	227,064	156,071
Total current liabilities		925,793	372,244	332,678
Long-term debt		2,809,293	1,982,751	1,982,527
Deferred income taxes, net		706,726	702,854	683,999
Deferred revenue		195,020	198,388	203,800
Other noncurrent liabilities		631,007	642,762	607,778
Total liabilities		5,267,839	3,898,999	3,810,782
Other commitments and contingencies (Note 8)
Equity
Common stock, $1 par value - Authorized 480,000 shares, Outstanding 132,181, 132,339 and 133,027 shares, respectively		132,181	132,339	133,027
Preferred stock, no par value, Authorized 5,000 shares, Outstanding none		0	0	0
Capital in excess of par value		2,797,269	2,807,995	2,804,279
Retained earnings		1,810,528	1,771,518	1,661,459
Accumulated other comprehensive loss		(137,874)	(139,376)	(119,434)
Total equity		4,602,104	4,572,476	4,479,331
Total liabilities and equity		$ 9,869,943	$ 8,471,475	$ 8,290,113

[1] Current maturities as of June 30, 2017 includes $522.5 million of notes due in 2018 which were early retired in July 2017 as discussed below within the Term Debt caption.