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Goodwill and Other Intangibles (Tables) | 12 Months Ended
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Dec. 31, 2019
Goodwill and Other Intangibles |
Change in goodwill | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018
Goodwill, balance at January 1, | ​ | $ | 807,260 | ​ | $ | 789,058
Change in goodwill related to small acquisitions | ​ |  | 1,464 | ​ |  | 18,202
Provisional goodwill and intangibles related to Mayasa acquisition | ​ | ​ | 128,090 | ​ | ​ | —
Goodwill, balance at December 31, | ​ | $ | 936,814 | ​ | $ | 807,260
Amortizable intangibles | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Cost of Amortizable | ​ | Accumulated Amortization | ​ | ​
​ | ​ | Intangibles | ​ | (Expense) Benefit | ​ | Net Amortizable Intangibles
​ |  | December 31, |  | December 31, |  | December 31, |  | December 31, |  | December 31, |  | December 31,
​ | ​ | 2019 | ​ | 2018 | ​ | 2019 | ​ | 2018 | ​ | 2019 | ​ | 2018
Amortizable intangible assets: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Favorable leases | ​ | $ | — | ​ | $ | 18,930 | ​ | $ | — | ​ | $ | (12,564) | ​ | $ | — | ​ | $ | 6,366
Non-compete agreements | ​ |  | 2,717 | ​ |  | 2,757 | ​ |  | (928) | ​ |  | (679) | ​ |  | 1,789 | ​ |  | 2,078
Total amortizable intangible assets | ​ | $ | 2,717 | ​ | $ | 21,687 | ​ | $ | (928) | ​ | $ | (13,243) | ​ | $ | 1,789 | ​ | $ | 8,444
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unfavorable leases | ​ | $ | — | ​ | $ | 10,180 | ​ | $ | — | ​ | $ | 8,486 | ​ | $ | — | ​ | $ | 1,694
Estimated net amortization of intangibles | ​
​ | ​ | ​ | ​
​ | ​ | December 31, 2019
​ |  | Amortization Expense
2020 | ​ | $ | 296
2021 | ​ |  | 275
2022 | ​ |  | 247
2023 | ​ |  | 218
2024 | ​ |  | 201
Total | ​ | $ | 1,237

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