Supplemental Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2017

Supplemental Cash Flow Elements [Abstract]

Components of Change in Other Assets and Liabilities, Net

The components of the change in other assets and liabilities, net, are as follows:

years ended December 31

(add 000)	2017			2016			2015
Other current and noncurrent assets	$	(19,424	)	$	9,171		$	(3,631	)
Accrued salaries, benefits and payroll taxes		136			16,942			(4,854	)
Accrued insurance and other taxes		4,866			(2,688	)		4,425
Accrued income taxes		(11,044	)		(12,523	)		(4,364	)
Accrued pension, postretirement and postemployment    benefits		1,980			(15,955	)		(18,153	)
Other current and noncurrent liabilities		38,105			(6,053	)		(3,014	)
Change in other assets and liabilities, net	$	14,619		$	(11,106	)	$	(29,591	)

Schedule Of Other Significant Noncash Transactions [Text Block]

Noncash investing and financing activities are as follows:

years ended December 31

(add 000)	2017		2016		2015
Accrued liabilities for purchases of property, plant and equipment	$	61,644	$	38,566	$	22,285
Acquisition of assets through capital lease	$	811	$	1,399	$	1,445
Acquisition of assets through asset exchange	$	2,476	$	-	$	5,000
Sale of asset to settle liability	$	900	$	-	$	-

Supplemental Disclosures of Cash Flow Information

Supplemental disclosures of cash flow information are as follows:

years ended December 31

(add 000)	2017		2016		2015
Cash paid for interest	$	78,902	$	73,664	$	71,011
Cash paid for income taxes	$	155,771	$	124,342	$	46,774