Goodwill and Intangible Assets (Goodwill Rollforward) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Beginning balance	$ 254,664	$ 1,137
Ending balance	254,832	254,664
VNS [Member]
Goodwill [Roll Forward]
Goodwill acquired during period		9,287
Measurement period adjustment	142
RBI [Member]
Goodwill [Roll Forward]
Goodwill acquired during period		44,541
Measurement period adjustment	(124)
SBS [Member]
Goodwill [Roll Forward]
Goodwill acquired during period		$ 199,699
Measurement period adjustment	$ 150