Accounts Receivable, Net (Tables)

12 Months Ended

Dec. 31, 2017

Receivables [Abstract]

Schedule of Accounts Receivable Net

(add 000)	2017			2016
Customer receivables	$	480,073		$	456,508
Other current receivables		9,557			7,668
		489,630			464,176
Less allowances		(2,390	)		(6,266	)
Total	$	487,240		$	457,910