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Intangible Assets
12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
Intangible Assets
Intangible assets other than goodwill, which are subject to amortization, consist of the following:
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net
Balance
Balance at December 31, 2019
 
 
 
 
 
Coal supply agreement
$
84,200

 
$
(46,298
)
 
$
37,902

 
 
 
 
 
 
Balance at December 31, 2018
 
 
 
 
 
Coal supply agreement
$
84,200

 
$
(43,684
)
 
$
40,516

 
 
 
 
 
 

Amortization expense for intangible assets was $2.6 million and $3.0 million in 2019 and 2018, respectively.
Expected annual amortization expense of NACCO's coal supply agreement for the next five years is as follows: $3.0 million in 2020 and $3.1 million in 2021, 2022, 2023 and 2024, respectively. The coal supply agreement is amortized based on units of production over the term of the agreement, which is estimated to be 30 years.