Goodwill (Tables)

6 Months Ended

Jun. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in Carrying Value of Goodwill by Operating Segment

six months ended June 30, 2018 are as follows:

(in thousands)	Retail		National Programs		Wholesale Brokerage		Services		Total
Balance as of January 1, 2018	$	1,386,248	$	908,472	$	286,098	$	135,261	$	2,716,079
Goodwill of acquired businesses	124,230		—		5,545		—		129,775
Balance as of June 30, 2018	$	1,510,478	$	908,472	$	291,643	$	135,261	$	2,845,854