Summary of Significant Accounting Policies (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Feb. 21, 2011	Dec. 31, 2008
Summary of Significant Accounting Policies [Abstract]
Accumulated Other Comprehensive Income (Loss), foreign currency translation adjustment	$ (20,286)	$ (17,145)	$ (17,907)		$ (23,011)
Restricted Cash	3,279	0
Number of shares authorized for repurchase (in shares)				1,000,000
Machine warranty, range minimum (in years)		1
Machine warranty, range maximum (in years)		4
Advertising Costs	$ 6,728	$ 5,516	$ 4,380
Building and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful life, Average (in years)	30
Other Property, Plant and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful life, Minimum (in years)	3
Property, Plant and Equipment, Useful life, Maximum (in years)	15