Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Current assets:
Cash and cash equivalents	$ 67,077	$ 34,599	$ 37,356
Receivables, net	787,344	727,030	739,402
Inventories	270,293	226,583	232,555
Prepayments and other current assets	88,760	81,304	89,625
Current assets held for sale	571	479	304
Total current assets	1,214,045	1,069,995	1,099,242
Investments	143,303	137,613	133,895
Property, plant and equipment	7,102,960	6,770,829	6,658,891
Less accumulated depreciation, depletion and amortization	2,796,649	2,691,641	2,667,762
Net property, plant and equipment	4,306,311	4,079,188	3,991,129
Deferred charges and other assets:
Goodwill	640,203	631,791	631,791
Other intangible assets, net	4,318	3,837	4,209
Other	408,178	407,850	419,846
Noncurrent assets held for sale	1,835	4,392	64,333
Total deferred charges and other assets	1,054,534	1,047,870	1,120,179
Total assets	6,718,193	6,334,666	6,344,445
Current liabilities:
Long-term debt due within one year	3,915	148,499	148,499
Accounts payable	339,713	312,327	304,101
Taxes payable	50,461	42,537	108,946
Dividends payable	38,714	38,573	37,596
Accrued compensation	62,836	72,919	67,097
Other accrued liabilities	221,620	186,010	184,580
Current liabilities held for sale	7,959	11,993	5,749
Total current liabilities	725,218	812,858	856,568
Long-term debt	1,911,555	1,566,354	1,592,053
Deferred credits and other liabilities:
Deferred income taxes	405,761	347,271	652,413
Other	1,154,366	1,179,140	889,494
Total deferred credits and other liabilities	1,560,127	1,526,411	1,541,907
Commitments and contingencies
Stockholders' equity:
Authorized - 500,000,000 shares, $1.00 par value Shares issued - 196,557,245 at September 30, 2018 and 195,843,297 at September 30, 2017 and December 31, 2017	196,557	195,843	195,843
Other paid-in capital	1,247,151	1,233,412	1,232,766
Retained earnings	1,124,830	1,040,748	964,275
Accumulated other comprehensive loss	(43,619)	(37,334)	(35,341)
Treasury stock at cost - 538,921 shares	(3,626)	(3,626)	(3,626)
Total stockholders' equity	2,521,293	2,429,043	2,353,917
Total liabilities and stockholders' equity	$ 6,718,193	$ 6,334,666	$ 6,344,445