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Goodwill, Intangible Assets and Deferred Charges
 6 Months Ended
Jun. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill, Intangible Assets and Deferred Charges Goodwill, Intangible Assets and Deferred Charges
Goodwill
The Company's goodwill balance of $12.6 million as of June 30, 2022 and year ended December 31, 2021 was attributable to the Specialty Chemicals Segment.

Intangible Assets
Intangible assets represent the fair value of intellectual, non-physical assets resulting from business acquisitions and are amortized over their estimated useful life using either an accelerated or straight-line method over a period of eight to 15 years.
The balance of intangible assets subject to amortization are as follows:
(in thousands)June 30, 2022December 31, 2021
Intangible assets, gross$28,876 $28,876 
Accumulated amortization of intangible assets(15,936)(14,494)
Intangible assets, net$12,940 $14,382 
Estimated amortization expense related to intangible assets for the next five years are as follows:
(in thousands)
Remainder of 2022$1,442 
20231,433 
20241,336 
20251,238 
20261,141 
20271,044 
Thereafter5,306 
Deferred Charges
Deferred charges represent debt issuance costs and are amortized over their estimated useful lives using the straight-line method over a period of four years.
The balance of deferred charges subject to amortization are as follows:
(in thousands)June 30, 2022December 31, 2021
Deferred charges, gross$398 $398 
Accumulated amortization of deferred charges(145)(96)
Deferred charges, net$253 $302