Summary of Changes in Goodwill (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Goodwill [Line Items]
Balance at beginning of year	$ 90,746
Balance at end of year	103,456
Applimotion Inc.
Goodwill [Line Items]
Goodwill acquired from acquisition	7,672
Lincoln Laser Company
Goodwill [Line Items]
Goodwill acquired from acquisition	3,367
Skyetek Inc.
Goodwill [Line Items]
Goodwill acquired from acquisition	$ 1,671