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Intangible Assets, Net
 12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets, Net Intangible Assets, Net
The following table shows changes in the carrying amount of intangible assets, net, by reportable segment.
Mobile SolutionsPower SolutionsTotal
Balance as of December 31, 2018$35,892 $95,991 $131,883 
Amortization(3,479)(10,994)(14,473)
Other3 — 3 
Balance as of December 31, 201932,416 84,997 117,413 
Amortization(3,354)(10,994)(14,348)
Balance as of December 31, 2020$29,062 $74,003 $103,065 
The following table shows the cost and accumulated amortization of our intangible assets as of December 31, 2020 and 2019.
  December 31, 2020December 31, 2019
 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
$173,746 $(74,250)$99,496 $173,746 $(60,603)$113,143 
Trademark and trade name
8 - 15
7,527 (3,958)3,569 7,527 (3,257)4,270 
Total identified intangible assets$181,273 $(78,208)$103,065 $181,273 $(63,860)$117,413 
Intangible assets that are fully amortized are removed and no longer represented in the gross carrying value or accumulated amortization.
The following table shows estimated future amortization expense for the next five years and thereafter.
Year Ending December 31,
2021$14,347 
202214,347 
202314,262 
202413,919 
202513,919 
Thereafter32,271 
Total$103,065 
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, 2020 and 2019, there were no indications of impairment.