Acquisitions - Horizon Analog Acquisition (Details) - USD ($) $ in Thousands		6 Months Ended
	Dec. 10, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Business Acquisition [Line Items]
Cash not yet paid for business acquisitions		$ 834	$ 0
Goodwill		$ 24,723		$ 21,374
Horizon Analog
Business Acquisition [Line Items]
Cash paid to acquire business	$ 600
Cash not yet paid for business acquisitions	100
Property and equipment recorded in connection with acquisition (less than)	100
Goodwill	$ 700