Goodwill (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Carrying value of goodwill by reporting segment and the activity

The carrying value of goodwill and the activity for the two year period ending December 31, 2017 are as follows (in thousands):

Balance, December 31, 2015	$	596,316
Goodwill from acquisitions	220,795
Currency translation adjustments	(15,705		)
Balance, December 31, 2016	801,406
Goodwill from acquisitions	96,431
Classification as asset held for sale	(13,090		)
Currency translation adjustments	25,064
Balance, December 31, 2017	$	909,811