Accrued Expenses Components of Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Salaries and wages	$ 31,297	$ 32,959
Warranty cost	23,226	23,302
Taxes other than income taxes, primarily value added taxes	17,304	19,194
Freight	5,226	5,211
Professional	4,599	4,728
Product liability, current portion	3,286	3,996
Severance	3,030	2,049
Deferred revenue	2,808	1,446
Interest	1,604	3,747
Rent	1,204	672
Derivative liabilities	1,025	1,783
Insurance	956	742
Rebates	609	356
Supplemental Executive Retirement Program liability	391	391
Other items, principally trade accruals	10,650	9,519
Accrued expenses	$ 107,215	$ 110,095