CONSOLIDATED INCOME STATEMENTS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
CONSOLIDATED INCOME STATEMENTS [Abstract]
Gross Sales	$ 317,212	$ 277,931	$ 254,475
Commissions, allowances and rebates	1,351	2,503	1,776
Net sales	315,861	275,428	252,699
Other	2,315	1,073	2,954
Net revenues	318,176	276,501	255,653
Cost of goods sold	215,272	186,014	181,569
Gross profit	102,904	90,487	74,084
Selling, general and administrative expenses	47,568	45,248	39,227
Research and development expenses	10,387	9,544	11,037
Total operating expenses	57,955	54,792	50,264
Gain on sale of asset	4,680	0	0
Operating profit	49,629	35,695	23,820
Other expenses/(income)
Interest expense, net	2,242	2,439	2,373
Other expenses/(income), net	118	122	(111)
Equity in losses of partially-owned affiliates	2,262	1,766	1,621
Income before income taxes	45,007	31,368	19,937
Provision/(benefit) for income taxes	14,732	(31,861)	6,202
Income from continuing operations	30,275	63,229	13,735
Loss from discontinued operations, net of tax	(4,360)	(926)	(2,767)
Net income	$ 25,915	$ 62,303	$ 10,968
Basic earnings per share
Income from continuing operations (in dollars per share)	$ 1.00	$ 2.13	$ 0.46
Loss from discontinued operations, net of tax (in dollars per share)	$ (0.14)	$ (0.03)	$ (0.09)
Net income (in dollars per share)	$ 0.86	$ 2.10	$ 0.37
Diluted earnings per share
Income from continuing operations (in dollars per share)	$ 0.98	$ 2.09	$ 0.46
Loss from discontinued operations, net of tax (in dollars per share)	$ (0.14)	$ (0.03)	$ (0.09)
Net income (in dollars per share)	$ 0.84	$ 2.06	$ 0.37
Weighted average shares outstanding:
Basic weighted average shares outstanding (in shares)	30,150	29,703	29,468
Effect of dilutive stock based compensation (in shares)	751	611	96
Diluted weighted average shares outstanding (in shares)	30,901	30,314	29,564