Segment Information (Geographic Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended														12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011	Dec. 31, 2010		Sep. 30, 2010		Jun. 30, 2010		Mar. 31, 2010		Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Segment Reporting Information [Line Items]
Net sales	$ 138,200	$ 143,594	[1]	$ 135,298	[2]	$ 124,380	$ 131,469	[3]	$ 124,371	[4]	$ 123,574	[5]	$ 102,927	[6]	$ 541,472	$ 482,341	$ 411,910
United States [Member]
Segment Reporting Information [Line Items]
Net sales															254,953	258,840	238,241
Japan [Member]
Segment Reporting Information [Line Items]
Net sales															73,335	47,639	13,590
United Kingdom [Member]
Segment Reporting Information [Line Items]
Net sales															32,948	29,298	24,967
Germany [Member]
Segment Reporting Information [Line Items]
Net sales															20,513	18,446	17,131
France [Member]
Segment Reporting Information [Line Items]
Net sales															20,302	15,445	14,874
Canada [Member]
Segment Reporting Information [Line Items]
Net sales															19,986	15,451	15,517
South Korea [Member]
Segment Reporting Information [Line Items]
Net sales															12,546	5,332	5,559
Belgium [Member]
Segment Reporting Information [Line Items]
Net sales															11,419	8,792	8,875
China [Member]
Segment Reporting Information [Line Items]
Net sales															10,369	10,637	6,871
Netherlands [Member]
Segment Reporting Information [Line Items]
Net sales															6,861	7,491	7,037
Singapore [Member]
Segment Reporting Information [Line Items]
Net sales															6,661	4,090	5,704
Australia [Member]
Segment Reporting Information [Line Items]
Net sales															6,424	3,829	628
Mexico [Member]
Segment Reporting Information [Line Items]
Net sales															4,856	5,893	4,465
Denmark [Member]
Segment Reporting Information [Line Items]
Net sales															4,178	2,680	2,524
Spain [Member]
Segment Reporting Information [Line Items]
Net sales															3,665	5,380	7,716
Switzerland [Member]
Segment Reporting Information [Line Items]
Net sales															3,324	3,240	4,971
Hong Kong [Member]
Segment Reporting Information [Line Items]
Net sales															3,240	2,015	736
Norway [Member]
Segment Reporting Information [Line Items]
Net sales															3,094	1,161	13
Other [Member]
Segment Reporting Information [Line Items]
Net sales															$ 42,798	$ 36,682	$ 32,491

[1] Includes $2.8 million of net earnings related to a reversal of net uncertain tax positions (Refer to Note 12 of the Company's consolidated financial statements contained in Item 8 of this Annual Report for further information).

[2] Includes a $1.3 million, pre-tax, reduction in an environmental liability. Refer to Note 16 of the Company's consolidated financial statements contained in Item 8 of this Annual Report for further information.

[3] Includes a $0.9 million loss on debt extinguishment and a $0.3 million charge related to a litigation contingency. Refer to Note 16 of the Company's consolidated financial statements contained in Item 8 of this Annual Report for further information.

[4] Includes $3.5 million of net earnings related to a reduction in valuation allowance associated with foreign tax credits and a net $0.5 million of charges related to litigation and other contingencies. Refer to Notes 12 and 16 of the Company's consolidated financial statements contained in Item 8 of this Annual Report for further information.

[5] Includes an $11.5 million charge related to a litigation contingency. Refer to Note 16 of the Company's consolidated financial statements contained in Item 8 of this Annual Report for further information.

[6] Includes a $2.7 million gain on acquisitions. The results of the last three quarters of 2010 include the impacts of the first quarter 2010 acquisitions. Refer to Note 2 of the Company's consolidated financial statements contained in Item 8 of this Annual Report for further information.