Segment Reporting (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 [Abstract]
Number of operating segments	4								4
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	$ 193,158	$ 186,990	$ 201,259	$ 172,591	$ 182,789	$ 168,637	$ 166,137	$ 150,106	$ 753,998	$ 667,667	$ 595,875
Long-lived assets	133,428				137,067				133,428	137,067	151,802
Maximum percentage sales by single customer to consolidated net sales (in hundredths)									10.00%
Revenue from External Customer [Line Items]
Net Sales	193,158	186,990	201,259	172,591	182,789	168,637	166,137	150,106	753,998	667,667	595,875
Equipment Sales [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales									452,398	389,137	329,871
Revenue from External Customer [Line Items]
Net Sales									452,398	389,137	329,871
Parts and Consumables [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales									177,999	160,994	151,932
Revenue from External Customer [Line Items]
Net Sales									177,999	160,994	151,932
Service and Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales									100,650	96,828	95,046
Revenue from External Customer [Line Items]
Net Sales									100,650	96,828	95,046
Specialty Surface Coatings [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales									22,951	20,708	19,026
Revenue from External Customer [Line Items]
Net Sales									22,951	20,708	19,026
Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales									481,426	424,462	366,034
Long-lived assets	98,855				98,258				98,855	98,258	106,080
Revenue from External Customer [Line Items]
Net Sales									481,426	424,462	366,034
Europe, Middle East, Africa [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales									188,338	172,619	177,829
Long-lived assets	29,390				34,497				29,390	34,497	41,016
Revenue from External Customer [Line Items]
Net Sales									188,338	172,619	177,829
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales									84,234	70,586	52,012
Long-lived assets	5,183				4,312				5,183	4,312	4,706
Revenue from External Customer [Line Items]
Net Sales									$ 84,234	$ 70,586	$ 52,012