CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Statement [Abstract]
Net sales	$ 201,662	$ 202,223	$ 380,187	$ 352,902
Cost of sales	152,793	163,564	282,596	288,821
Gross profit	48,869	38,659	97,591	64,081
Selling, general and administrative expense	24,498	25,125	52,156	49,616
Provisions for (recovery of) losses on accounts receivable	3	166	(156)	266
Property insurance recoveries in excess of losses incurred			(5,147)
Other expense, net	604	1,143	1,113	2,211
Operating income	23,764	12,225	49,625	11,988
Interest expense, net	5,671	536	12,379	1,267
Non-operating other expense (income), net	(76)	8	(153)	24
Income from continuing operations before provisions for income taxes and equity in earnings of affiliate	18,169	11,681	37,399	10,697
Provisions for income taxes	7,047	4,367	14,701	3,622
Equity in earnings of affiliate	(12)	(172)	(79)	(343)
Income from continuing operations	11,134	7,486	22,777	7,418
Net loss from discontinued operations	21	59	23	59
Net income	11,113	7,427	22,754	7,359
Dividends on preferred stocks			300	300
Net income applicable to common stock	$ 11,113	$ 7,427	$ 22,454	$ 7,059
Weighted-average common shares:
Basic	22,544,857	22,437,485	22,538,773	22,430,589
Diluted	23,660,238	23,577,383	23,650,439	22,914,660
Income per common share:
Basic	$ 0.49	$ 0.33	$ 1.00	$ 0.31
Diluted	$ 0.47	$ 0.31	$ 0.96	$ 0.31