Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Data [Abstract]

Schedule Of Quarterly Financial Information

				2017 Quarter
(in thousands, except per share data)				1st		2nd		3rd		4th
	Sales		$	566,501	$	616,904	$	603,550	$	679,856
	Gross profit			49,060		58,587		58,155		61,895
	Net income (loss)			9,687		17,176		17,512		(76,340)
	Earnings (loss) per common share:
		Basic		0.20		0.35		0.35		(1.54)
		Diluted		0.19		0.34		0.35		(1.54)
				2016 Quarter
(in thousands, except per share data)				1st		2nd		3rd		4th
	Sales		$	549,225	$	579,342	$	574,341	$	607,507
	Gross profit			50,317		52,854		52,822		57,470
	Net income			11,052		12,685		21,742		18,568
	Earnings per common share:
		Basic		0.22		0.26		0.44		0.38
		Diluted		0.22		0.26		0.44		0.37
				2015 Quarter
(in thousands, except per share data)				1st		2nd		3rd		4th
	Sales		$	620,925	$	664,038	$	630,191	$	625,719
	Gross profit			51,785		55,997		54,563		56,909
	Net income			14,205		21,210		20,565		39,421
	Earnings per common share:
		Basic		0.27		0.41		0.40		0.78
		Diluted		0.27		0.40		0.40		0.77