The following table presents changes in the carrying amount of intangible assets, net.



	Life Sciences			Mobile Solutions			Power Solutions			Total
Balance as of December 31, 2017	$	93,226		$	39,446		$	105,030		$	237,702
Amortization	(18,074		)	(3,540		)	(10,939		)	(32,553		)
Currency impacts and other	—			(14		)	—			(14		)
Intangible assets acquired in acquisitions	169,213			—			1,900			171,113
Balance as of December 31, 2018	244,365			35,892			95,991			376,248
Amortization	(32,525		)	(3,479		)	(10,994		)	(46,998		)
Other	7			3			—			10
Balance as of December 31, 2019	$	211,847		$	32,416		$	84,997		$	329,260

The following table shows the cost and accumulated amortization of our intangible assets as of December 31, 2019 and 2018.



		December 31, 2019							December 31, 2018
	Estimated Useful Life in Years	Gross Carrying Value as of Acquisition Date		Accumulated Amortization			Net Carrying Value		Gross Carrying Value as of Acquisition Date		Accumulated Amortization			Net Carrying Value
Customer relationships	12 - 20	$	428,830	$	(118,976	)	$	309,854	$	428,830	$	(75,581	)	$	353,249
Trademark and trade name	8 - 30	25,100		(5,695		)	19,405		25,100		(4,085		)	21,015
Other	2	13		(12		)	1		10,641		(8,657		)	1,984
Total identified intangible assets		$	453,943	$	(124,683	)	$	329,260	$	464,571	$	(88,323	)	$	376,248

Intangible assets that are fully amortized are removed and no longer represented in the gross carrying value or accumulated amortization.

The following table presents estimated future amortization expense for the next five years and thereafter.



Year Ending December 31,
2020	$	45,365
2021	41,415
2022	38,464
2023	36,625
2024	33,888
Thereafter	133,503
Total	$	329,260

Intangible assets are reviewed for impairment when changes in circumstances indicate the carrying value of those assets may not be recoverable. As of December 31, 2019 and 2018, there were no indications of impairment.