Quarterly report pursuant to Section 13 or 15(d)

Goodwill (Details)

v3.10.0.1
Goodwill (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Balance at December 31, 2017 $ 89,806
Increase in goodwill associated with a business acquisition
Balance at September 30, 2018 218,151
Birch  
Increase in goodwill associated with a business acquisition 99,590
Balance at September 30, 2018 99,590
MegaPath  
Increase in goodwill associated with a business acquisition 28,755
Balance at September 30, 2018 $ 28,755