Goodwill and Intangible Assets (Tables)

6 Months Ended

Jun. 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 six months ended June 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	(6,089		)	1,133			(4,956		)
Balance as of June 30, 2018	$	225,762		$	(40,047	)	$	185,715

Acquired Intangible Assets excluding Goodwill

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

	Customer Lists			Trade Names			Technology			Total
Balance as of June 30, 2018
Original cost	$	145,455		$	31,105		$	15,554		$	192,114
Accumulated amortization	(25,990		)	(3,894		)	(4,556		)	(34,440		)
Carrying value	$	119,465		$	27,211		$	10,998		$	157,674
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	$	10,854
2019	21,206
2020	19,756
2021	18,165
2022	16,020
Thereafter	71,673
Total	$	157,674