Acquisitions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Acquisition of Business, Net of Cash Acquired	$ (59,946)	$ (18,093)	$ 0
Goodwill	30,114	13,737	$ 6,680
Cape Electrical Supply
Business Acquisition [Line Items]
Acquisition of Business, Net of Cash Acquired	(59,946)
Goodwill	16,377
Other Intangible Assets	$ 23,586
Advantage Industrial Automation
Business Acquisition [Line Items]
Acquisition of Business, Net of Cash Acquired		(18,093)
Goodwill		7,057
Other Intangible Assets		$ 8,283