Accrued Product Warranties (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) months	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Movement in Standard Product Warranty Accrual [Roll Forward]
Accrued product warranties, beginning of year	$ 20,845	$ 16,514	$ 16,175
Amounts paid for warranty services	(16,764)	(19,592)	(12,821)
Warranty provisions for products sold	14,422	22,928	13,074
Business acquisitions and disposals	0	1,215	395
Currency translation adjustments and other	(451)	(220)	(309)
Accrued product warranties, end of year	18,052	20,845	16,514
Current accrued product warranties, end of year	15,024	17,476	13,406
Long-term accrued product warranties, end of ear	$ 3,028	$ 3,369	$ 3,108
Minimum
Product Warranty Liability [Line Items]
Product warranty term | months	12
Maximum
Product Warranty Liability [Line Items]
Product warranty term | months	24