Current Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accrued Liabilities, Current [Abstract]
Salaries and wages	$ 40,252	$ 41,813
Taxes other than income taxes, primarily Value Added Taxes	24,525	24,600
Warranty cost	27,393	21,451	19,842
Freight	7,636	7,853
Professional	6,516	7,595
Product liability, current portion	3,183	3,323
Rebates	1,681	3,635
Insurance	2,549	2,674
Interest	1,041	1,268
Derivative liabilities (foreign forward exchange contracts)	1,212	1,373
Severance	3,986	5,211
Other items, principally trade accruals	13,126	14,393
Accrued expenses	$ 133,100	$ 135,189