Current Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accrued Liabilities, Current [Abstract]
Salaries and wages	$ 41,813	$ 41,508
Taxes other than income taxes, primarily Value Added Taxes	24,600	23,107
Warranty cost	21,451	19,842	18,252
Freight	7,853	8,510
Professional	7,595	7,252
Product liability, current portion	3,323	3,468
Rebates	3,635	3,681
Insurance	2,674	2,657
Interest	1,268	1,255
Derivative liabilities (foreign forward exchange contracts)	1,373	893
Severance	5,211	4,905
Other items, principally trade accruals	14,393	11,615
Accrued expenses	$ 135,189	$ 128,693