Fair Value of Financial Instruments and Concentrations of Credit Risk (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Schedule of accounts receivable

Receivables consisted of the following at December 31:

(In thousands)	2018			2017
Trade receivables:
Gross trade receivables	$	248,176		$	256,851
Allowance for doubtful accounts	(10,034		)	(9,457		)
Net trade receivables	238,142			247,394
Income tax receivables	9,027			6,905
Other receivables	7,225			11,567
Total receivables, net	$	254,394		$	265,866

Schedule of allowance for doubtful accounts

Changes in this allowance were as follows:

(In thousands)	2018			2017			2016
Balance at beginning of year	$	9,457		$	8,849		$	7,189
Provision for uncollectible accounts	2,849			1,481			2,416
Write-offs, net of recoveries	(2,272		)	(873		)	(756		)
Balance at end of year	$	10,034		$	9,457		$	8,849