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Capitalized Interest (Tables) | 12 Months Ended
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Dec. 31, 2020
Capitalized Interest Costs, Including Allowance for Funds Used During Construction [Abstract] |
Summary of Interest Costs Incurred, Capitalized, Expensed and Charged to Cost of Sales | Our interest costs incurred, capitalized, expensed and charged to cost of sales during the years ended December 31, 2020, 2019 and 2018 was as follows:
|  | December 31,
|  | 2020 |  | 2019 |  | 2018
Interest capitalized, beginning of year |  | $ | 3,499 |  |  | $ | 4,154 |  |  | $ | 5,583 |
Interest incurred |  | 41,327 |  |  | 26,463 |  |  | 26,277 |
Interest charged to interest expense |  | (40,872) |  |  | (25,380) |  |  | (25,081) |
Interest charged to cost of sales |  | (2,929) |  |  | (1,738) |  |  | (2,625) |
Interest capitalized, end of year |  | $ | 1,025 |  |  | $ | 3,499 |  |  | $ | 4,154 |

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