Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Identified Intangible Assets - Change in Carrying Amount of Goodwill (Details)

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Goodwill and Identified Intangible Assets - Change in Carrying Amount of Goodwill (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2017
USD ($)
Goodwill [Roll Forward]  
Beginning balance $ 259,938
Goodwill acquired 305,451
Other 36
Ending balance $ 565,425