Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting [Abstract]
Number of operating segments									4
Revenues from External Customers and Long-Lived Assets
Net Sales	$ 187,507	$ 178,268	$ 199,493	$ 173,712	$ 193,158	$ 186,990	$ 201,259	$ 172,591	$ 738,980	$ 753,998	$ 667,667
Long-Lived Assets	135,056				133,428				135,056	133,428	137,067
Maximum percentage sales by single customer to consolidated net sales									10.00%
Equipment
Revenues from External Customers and Long-Lived Assets
Net Sales									435,900	452,398	389,137
Parts and consumables
Revenues from External Customers and Long-Lived Assets
Net Sales									175,782	177,999	160,994
Service and other
Revenues from External Customers and Long-Lived Assets
Net Sales									106,048	100,650	96,828
Specialty surface coatings
Revenues from External Customers and Long-Lived Assets
Net Sales									21,250	22,951	20,708
Americas
Revenues from External Customers and Long-Lived Assets
Net Sales									491,661	481,426	424,462
Long-Lived Assets	99,666				98,855				99,666	98,855	98,258
Europe, Middle East, Africa
Revenues from External Customers and Long-Lived Assets
Net Sales									166,208	188,338	172,619
Long-Lived Assets	30,891				29,390				30,891	29,390	34,497
Asia Pacific
Revenues from External Customers and Long-Lived Assets
Net Sales									81,111	84,234	70,586
Long-Lived Assets	$ 4,499				$ 5,183				$ 4,499	$ 5,183	$ 4,312