Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2013

Quarterly Financial Information Disclosure [Abstract]

Unaudited quarterly results of operations

The table below summarizes the unaudited quarterly results of operations for the past two years (in thousands, except per share data):

	Quarter
	2013									2012
	First		Second		Third		Fourth			First		Second		Third		Fourth
Net sales	$	370,362	$	790,392	$	578,157	$	340,789		$	361,954	$	757,175	$	528,027	$	306,818
Gross profit	104,761		228,166		162,557		95,793			104,563		222,405		151,501		88,938
Net income (loss)	3,440		66,533		32,332		(4,975		)	3,651		64,943		21,375		(7,997		)
Earnings (loss) per share:
Basic	$	0.07	$	1.43	$	0.70	$	(0.11	)	$	0.08	$	1.38	$	0.46	$	(0.17	)
Diluted	$	0.07	$	1.39	$	0.68	$	(0.11	)	$	0.08	$	1.34	$	0.45	$	(0.17	)