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Goodwill and Other Intangible Assets
 12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets GOODWILL AND OTHER INTANGIBLE ASSETS
The changes in the carrying amount of goodwill for the years ended December 31, 2020 and 2019 are as follows:
 FPDFCDTotal
 (Amounts in thousands)
Balance as of December 31, 2018$790,139 $407,501 $1,197,640 
Currency translation and other(3,509)(1,121)(4,630)
Balance as of December 31, 2019$786,630 $406,380 $1,193,010 
Currency translation and other18,425 13,451 31,876 
Balance as of December 31, 2020$805,055 $419,831 $1,224,886 
The following table provides information about our intangible assets for the years ended December 31, 2020 and 2019:
 December 31, 2020December 31, 2019
Useful
Life
(Years)		Ending
Gross
Amount		Accumulated
Amortization		Ending
Gross
Amount		Accumulated
Amortization
 (Amounts in thousands, except years)
Finite-lived intangible assets:     
Engineering drawings(1)
10-22
$90,638 $(83,620)$89,490 $(78,854)
Existing customer relationships(2)
5-10
85,214 (62,796)81,844 (53,468)
Patents
9-16
27,015 (27,015)26,132 (26,132)
Other
4-40
93,923 (43,633)92,920 (40,149)
  $296,790 $(217,064)$290,386 $(198,603)
Indefinite-lived intangible assets(3) $90,355 $(1,585)$90,607 $(1,585)
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(1)Engineering drawings represent the estimated fair value associated with specific acquired product and component schematics.
(2)Existing customer relationships acquired prior to 2011 had a useful life of five years.
(3)Accumulated amortization for indefinite-lived intangible assets relates to amounts recorded prior to the implementation date of guidance issued in ASC 350.
The following schedule outlines actual amortization expense recognized during 2020 and an estimate of future amortization based upon the finite-lived intangible assets owned at December 31, 2020:
 Amortization
Expense
 (Amounts in thousands)
Actual for year ended December 31, 2020$13,645 
Estimated for year ended December 31, 202114,313 
Estimated for year ended December 31, 202212,298 
Estimated for year ended December 31, 20239,283 
Estimated for year ended December 31, 20244,286 
Estimated for year ended December 31, 20252,338 
Thereafter37,208 

Amortization expense for finite-lived intangible assets was $13.8 million in 2019 and $14.1 million in 2018.