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Goodwill (Tables)
 3 Months Ended
Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Carrying Value of Goodwill by Operating Segment
The changes in the carrying value of goodwill by reportable segment for the three months ended March 31, 2017 are as follows:
(in thousands)
Retail
 
National
Programs
 
Wholesale
Brokerage
 
Services
 
Total
Balance as of January 1, 2017
$
1,354,667

 
$
901,294

 
$
284,869

 
$
134,572

 
$
2,675,402

Goodwill of acquired businesses
(133
)
 
—

 
(127
)
 
689

 
429

Balance as of March 31, 2017
$
1,354,534

 
$
901,294

 
$
284,742

 
$
135,261

 
$
2,675,831