Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Data [Abstract]

Schedule Of Quarterly Financial Information

				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
				2014 Quarter
(in thousands, except per share data)				1st		2nd		3rd		4th
	Sales		$	639,344	$	716,868	$	731,302	$	709,547
	Gross profit			51,153		57,757		55,299		56,107
	Net income			19,439		21,558		16,906		23,338
	Earnings per common share:
		Basic		0.36		0.40		0.32		0.44
		Diluted		0.36		0.40		0.31		0.44