Accounting Policies Account policies (Details textual) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash and Cash Equivalents [Line Items]
Cash and Cash Equivalents, at Carrying Value	$ 55,300,000	$ 49,600,000	$ 65,900,000	$ 90,700,000
Policy for Allowance for slow-moving inventory	24 months
Research and Development Expense	15,100,000	19,800,000	18,600,000
Prior Period Reclassification Adjustment		2,400,000
Outside of North America [Member]
Cash and Cash Equivalents [Line Items]
Cash and Cash Equivalents, at Carrying Value	$ 22,300,000.0	$ 21,300,000.0