Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in the carrying value of Goodwill

The changes in the carrying value of Goodwill for the nine months ended September 30, 2018 were as follows:

	Goodwill			Accumulated Impairment Losses			Total
Balance as of December 31, 2017	$	227,224		$	(41,180	)	$	186,044
Purchase accounting adjustments	4,627			—			4,627
Foreign currency fluctuations	(7,542		)	1,490			(6,052		)
Balance as of September 30, 2018	$	224,309		$	(39,690	)	$	184,619

Acquired Intangible Assets excluding Goodwill

The balances of acquired Intangible Assets, excluding Goodwill, as of September 30, 2018 and December 31, 2017, were as follows:

	Customer Lists			Trade Names			Technology			Total
Balance as of September 30, 2018
Original cost	$	144,760		$	30,945		$	17,134		$	192,839
Accumulated amortization	(29,908		)	(4,631		)	(5,326		)	(39,865		)
Carrying value	$	114,852		$	26,314		$	11,808		$	152,974
Weighted average original life (in years)	15			10			11
Balance as of December 31, 2017
Original cost	$	149,355		$	31,968		$	14,589		$	195,912
Accumulated amortization	(17,870		)	(2,436		)	(3,259		)	(23,565		)
Carrying value	$	131,485		$	29,532		$	11,330		$	172,347
Weighted average original life (in years)	15			10			11

Estimated aggregate amortization expense of Intangible Assets

Estimated aggregate amortization expense based on the current carrying value of amortizable Intangible Assets for each of the five succeeding years and thereafter is as follows:

Remaining 2018	$	5,456
2019	21,268
2020	19,827
2021	18,244
2022	15,965
Thereafter	72,214
Total	$	152,974