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Goodwill and Other Intangibles
 6 Months Ended
Jun. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangibles Goodwill and Other Intangibles:
The following table summarizes the changes in goodwill by reportable segment for the six-month period ended June 30, 2024 (in thousands):
Energy StorageSpecialtiesKetjenTotal
Balance at December 31, 2023(a)
$1,424,484 $32,639 $172,606 $1,629,729 
   Foreign currency translation adjustments(22,719)(51)(6,021)(28,791)
Balance at June 30, 2024(a)
$1,401,765 $32,588 $166,585 $1,600,938 
(a)    Balance at June 30, 2024 and December 31, 2023 includes an accumulated impairment loss of $6.8 million in Ketjen. As a result, the balance of Ketjen at June 30, 2024 and December 31, 2023 fully consists of goodwill related to the Refining Solutions reporting unit.

The following table summarizes the changes in other intangibles and related accumulated amortization for the six-month period ended June 30, 2024 (in thousands):
Customer Lists and Relationships
Trade Names and Trademarks(a)
Patents and TechnologyOtherTotal
Gross Asset Value
  Balance at December 31, 2023
$417,803 $13,405 $46,287 $34,649 $512,144 
Retirements— (2,309)(14,506)(4,409)(21,224)
Foreign currency translation adjustments and other(11,338)(264)(745)(769)(13,116)
  Balance at June 30, 2024
$406,465 $10,832 $31,036 $29,471 $477,804 
Accumulated Amortization
  Balance at December 31, 2023
$(204,481)$(3,673)$(26,758)$(15,374)$(250,286)
Amortization(9,877)— (1,276)(452)(11,605)
Retirements— 2,309 14,506 4,409 21,224 
Foreign currency translation adjustments and other5,409 40 453 296 6,198 
  Balance at June 30, 2024
$(208,949)$(1,324)$(13,075)$(11,121)$(234,469)
Net Book Value at December 31, 2023
$213,322 $9,732 $19,529 $19,275 $261,858 
Net Book Value at June 30, 2024
$197,516 $9,508 $17,961 $18,350 $243,335 
(a)    Net Book Value includes only indefinite-lived intangible assets.