Acquisition (Details) - USD ($) $ in Thousands	Apr. 28, 2017	Sep. 30, 2017	Dec. 31, 2016
Cost of acquired entity
Goodwill		$ 346,097	$ 343,766
Surgical laser equipment service provider
Cost of acquired entity
Total purchase price	$ 6,300
Cash paid	5,600
Holdback and earnout payment	700
Inventories	50
Property and equipment	931
Goodwill	2,144
Intangible assets	3,192
Accrued compensation	(14)
Total purchase price	$ 6,303