Accrued Product Warrenties (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Movement in Standard Product Warranty Accrual [Roll Forward]
Accrued product warranties, beginning of period	$ 17,492	$ 16,023	$ 16,514	$ 16,175
Amounts paid for warranty services	(3,624)	(3,731)	(13,221)	(10,701)
Warranty provisions for products sold	5,099	3,567	15,658	10,551
Currency translation and acquisition adjustments	1,025	(23)	1,041	(189)
Accrued product warranties, end of period	19,992	15,836	19,992	15,836
Current accrued product warranties, end of period	16,759	13,213	16,759	13,213	$ 13,406
Long-term accrued product warranties, end of period	$ 3,233	$ 2,623	$ 3,233	$ 2,623