Acquisitions - Narratives (Details) - USD ($) $ in Millions	1 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Aero Communications, Inc.
Business Acquisition [Line Items]
Payment to acquire business, net of cash acquired	$ 20.9
Texstar Enterprises, Inc.
Business Acquisition [Line Items]
Payment to acquire business, net of cash acquired		$ 26.1