Accrued Product Warrenties (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Movement in Standard Product Warranty Accrual [Roll Forward]
Accrued product warranties, beginning of period	$ 15,840	$ 16,712	$ 16,175	$ 17,732
Amounts paid for warranty services	(1,819)	(2,076)	(3,771)	(4,763)
Warranty provisions for products sold	1,867	1,322	3,784	3,292
Currency translation adjustments and other	134	31	(166)	(272)
Accrued product warranties, end of period	16,022	15,989	16,022	15,989
Current accrued product warranties, end of period	13,232	13,222	13,232	13,222	$ 13,538
Long-term accrued product warranties, end of period	$ 2,790	$ 2,767	$ 2,790	$ 2,767