Intangible Assets, Net

We have identified intangible assets with finite lives primarily representing customer relationships, trademarks, and trade names. In 2018, Life Sciences added $163.5 million and $5.7 million of intangible assets related to the Paragon Medical and Bridgemedica acquisitions, respectively. In addition, in 2018, Power Solutions added $1.9 million of intangible assets related to the Technical Arts acquisition. The intangible assets acquired in 2018 primarily represent customer relationships and trademarks and trade names with a weighted average estimated useful life of the acquired intangible assets of 19 years. Refer to Note 3 for further discussion on the 2018 acquisitions.

The following table shows the nature and preliminary weighted average estimated useful lives of intangible assets acquired during the year ended December 31, 2018. Actual results may differ from these projections, and the differences may be material.



	Gross Carrying Value as of Acquisition Date		Weighted Average Estimated Useful Life in Years
Customer relationships	$	146,800	20
Trademark and trade name	14,700		29
Other	9,613		1
Total intangible assets acquired in current year	$	171,113	19

As of January 1, 2018, as a result of the changes in our organizational and management structure, intangible assets were reassigned to operating segments with intangible assets assigned to Power Solutions and Life Sciences using a relative fair value allocation. For further information on the organizational changes, see Note 1.

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



	Mobile Solutions			Power Solutions			Life Sciences			Total
Balance as of December 31, 2016	$	42,928		$	115,928		$	95,407		$	254,263
Amortization	(3,481		)	(10,898		)	(9,081		)	(23,460		)
Currency impacts	(1		)	—			—			(1		)
Intangible assets acquired in acquisition	—			—			6,900			6,900
Balance as of December 31, 2017	$	39,446		$	105,030		$	93,226		$	237,702
Amortization	(3,540		)	(10,939		)	(18,074		)	(32,553		)
Currency impacts	(14		)	—			—			(14		)
Intangible assets acquired in acquisitions	—			1,900			169,213			171,113
Measurement period adjustments	—			—			—			—
Balance as of December 31, 2018	$	35,892		$	95,991		$	244,365		$	376,248

The following table shows the cost and accumulated amortization of our intangible assets as of December 31, 2018 and 2017.



		December 31, 2018							December 31, 2017
	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	$	(75,581	)	$	353,249	$	282,030	$	(52,408	)	$	229,622
Trademark and trade name	8 - 30	25,100		(4,085		)	21,015		10,460		(2,703		)	7,757
Other	1 - 5	10,641		(8,657		)	1,984		8,740		(8,417		)	323
Total identified intangible assets		$	464,571	$	(88,323	)	$	376,248	$	301,230	$	(63,528	)	$	237,702

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

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




Year Ending December 31,
2019	$	47,009
2020	45,357
2021	41,415
2022	38,464
2023	36,625
Thereafter	167,378
Total	$	376,248

Intangible assets are tested for impairment when changes in circumstances indicate the carrying value of those assets may not be recoverable. As of December 31, 2018 and 2017, there were no indications of impairment.