Consolidated Income Statements (unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Consolidated Income Statements (unaudited) [Abstract]
Gross sales	$ 97,972	$ 61,628	$ 164,164	$ 136,209
Commissions, allowances and rebates	625	65	1,174	228
Net sales	97,347	61,563	162,990	135,981
Other revenue	546	1,240	1,008	1,707
Net revenues	97,893	62,803	163,998	137,688
Cost of goods sold	64,478	43,552	114,005	93,688
Gross profit	33,415	19,251	49,993	44,000
Operating expenses:
Selling, general and administrative expenses	14,560	10,622	26,193	21,726
Research and development expenses	3,631	2,765	6,106	4,959
Total operating expenses	18,191	13,387	32,299	26,685
Gain on sale of asset	0	0	0	4,680
Operating profit	15,224	5,864	17,694	21,995
Other expenses/(income):
Interest expense, net	543	488	1,065	983
Other (income)/expense, net	(3)	38	(21)	6
Equity in losses of partially-owned affiliates	4,272	668	4,618	1,149
Income before income taxes	10,412	4,670	12,032	19,857
(Benefit)/provision for income taxes	(9,415)	1,534	(8,961)	5,296
Income from continuing operations	19,827	3,136	20,993	14,561
Loss from discontinued operations, net of tax	(160)	(862)	(344)	(1,119)
Net income	$ 19,667	$ 2,274	$ 20,649	$ 13,442
Basic earnings/(loss) per share of common stock:
Income from continuing operations (in dollars per share)	$ 0.65	$ 0.10	$ 0.69	$ 0.48
Loss from discontinued operations, net of tax (in dollars per share)	$ (0.01)	$ (0.03)	$ (0.02)	$ (0.03)
Net income (in dollars per share)	$ 0.64	$ 0.07	$ 0.67	$ 0.45
Diluted earnings/(loss) per share of common stock:
Income from continuing operations (in dollars per share)	$ 0.63	$ 0.10	$ 0.67	$ 0.47
Loss from discontinued operations, net of tax (in dollars per share)	$ 0	$ (0.03)	$ (0.01)	$ (0.03)
Net income (in dollars per share)	$ 0.63	$ 0.07	$ 0.66	$ 0.44
Weighted average shares outstanding:
Basic (in shares)	30,647	30,089	30,596	30,029
Effect of dilutive stock based compensation (in shares)	781	867	802	841
Diluted (in shares)	31,428	30,956	31,398	30,870