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
6 Months Ended
Jun. 30, 2018
USD ($)
Goodwill [Roll Forward]  
Beginning balance $ 751,052
Goodwill acquired 168,033
Measurement period adjustments (300)
Ending balance $ 918,785