Accrued Product Warrenties (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Movement in Standard Product Warranty Accrual [Roll Forward]
Accrued product warranties, beginning of period	$ 16,023	$ 15,989	$ 16,175	$ 17,732
Amounts paid for warranty services	(1,907)	(2,368)	(5,678)	(7,131)
Warranty provisions for products sold	1,745	2,254	5,529	5,546
Currency translation adjustments and other	(25)	(343)	(190)	(615)
Accrued product warranties, end of period	15,836	15,532	15,836	15,532
Current accrued product warranties, end of period	13,213	12,881	13,213	12,881	$ 13,538
Long-term accrued product warranties, end of period	$ 2,623	$ 2,651	$ 2,623	$ 2,651