Goodwill (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Change in Goodwill

The following table presents the change in goodwill from December 31, 2017 through December 31, 2018 (in thousands):

Balance as of December 31, 2017	$	1,931,076
Goodwill recorded in connection with acquisition of MLOA	53,831
Balance as of December 31, 2018	$	1,984,907