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Intangible Assets | 12 Months Ended
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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.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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