Accrued Product Warranties (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Movement in Standard Product Warranty Accrual [Roll Forward]
Accrued product warranties, beginning of year	$ 19,971	$ 17,227	$ 20,845	$ 16,514
Amounts paid for warranty services	(4,362)	(5,458)	8,991	9,598
Warranty provisions for products sold	3,782	5,826	7,491	10,560
Business acquisitions and disposals	0	0	0	0
Currency translation adjustments and other	139	(103)	185	16
Accrued product warranties, end of year	19,530	17,492	19,530	17,492
Current accrued product warranties, end of year	16,262	14,661	16,262	14,661	$ 17,476
Long-term accrued product warranties, end of ear	$ 3,268	$ 2,831	$ 3,268	$ 2,831