Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Data [Abstract]

Schedule Of Quarterly Financial Information

				2018 Quarter
(in thousands, except per share data)				1st		2nd		3rd		4th
	Sales		$	608,136	$	660,591	$	640,688	$	657,050
	Gross profit			58,318		54,299		52,777		55,199
	Net income (loss)			(23,641)		10,943		7,799		27,716
	Earnings (loss) per common share:
		Basic		(0.49)		0.23		0.17		0.64
		Diluted		(0.49)		0.23		0.17		0.64
				2017 Quarter (as adjusted)
(in thousands, except per share data)				1st		2nd		3rd		4th
	Sales		$	557,903	$	619,611	$	610,929	$	666,036
	Gross profit			47,532		59,484		58,243		60,661
	Net income (loss)			8,555		18,074		17,831		(76,361)
	Earnings (loss) per common share:
		Basic		0.17		0.36		0.36		(1.54)
		Diluted		0.17		0.36		0.35		(1.54)
				2016 Quarter (as adjusted)
(in thousands, except per share data)				1st		2nd		3rd		4th
	Sales		$	535,195	$	580,513	$	586,534	$	620,043
	Gross profit			48,409		53,200		54,180		58,896
	Net income			9,374		12,688		22,544		19,327
	Earnings per common share:
		Basic		0.19		0.26		0.46		0.39
		Diluted		0.19		0.26		0.46		0.39