Product Warranties (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Movement in Product Warranty Liability [Roll Forward]
Balance, beginning of period	$ 2,246	$ 1,638
Accruals	1,691	1,318
Payments	(1,118)	(881)
Balance, end of period	$ 2,819	$ 2,075
Minimum
Product Liability Contingency [Line Items]
Product warranty period	30 days