Accrued Product Warrenties (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Movement in Standard Product Warranty Accrual [Roll Forward]
Accrued product warranties, beginning of period	$ 17,227	$ 15,840	$ 16,514	$ 16,175
Amounts paid for warranty services	(5,458)	(3,547)	(9,598)	(6,971)
Warranty provisions for products sold	5,826	3,595	10,560	6,985
Currency translation adjustments and other	(103)	134	16	(167)
Accrued product warranties, end of period	17,492	16,022	17,492	16,022
Current accrued product warranties, end of period	14,661	13,232	14,661	13,232	$ 13,406
Long-term accrued product warranties, end of period	$ 2,831	$ 2,790	$ 2,831	$ 2,790