Accrued Expenses Components of Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Salaries and wages	$ 35,483	$ 41,216
Warranty cost	24,744	22,820
Taxes other than income taxes, primarily value added taxes	19,903	21,424
Professional	6,880	5,774
Freight	6,772	5,978
Product liability, current portion	3,564	3,127
Severance	1,698	2,477
Interest	1,694	872
Deferred revenue	1,525	400
Supplemental Executive Retirement Program liability	1,279	1,279
Derivative liabilities	1,137	2,014
Rent	932	402
Insurance	909	695
Rebates	560	1,791
Other items, principally trade accruals	11,604	8,687
Accrued expenses	$ 118,684	$ 118,956