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Intangible Assets, net (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Finite-Lived Intangible Assets | Intangible assets, net consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020 | ​ | December 31, 2019
​ | ​ | Gross | ​ | ​ | ​ | ​ | Gross | ​ | ​ | ​
​ | ​ | Carrying | ​ | Accumulated | ​ | Carrying | ​ | Accumulated
​ |  | Amount |  | Amortization |  | Amount |  | Amortization
Customer-related (10-25 year life) | ​ | $ | 147,169 | ​ | $ | (86,512) | ​ | $ | 147,244 | ​ | $ | (76,176)
Contract-based (5-7 year life) | ​ |  | 37,730 | ​ |  | (36,856) | ​ |  | 37,773 | ​ |  | (31,370)
Intangible assets | ​ | $ | 184,899 | ​ | $ | (123,368) | ​ | $ | 185,017 | ​ | $ | (107,546)
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | Estimated future intangible assets amortization expense as of December 31, 2020 was as follows (in thousands):
​ | ​ | ​ | ​
2021 |  | $ | 11,372
2022 | ​ |  | 9,171
2023 | ​ |  | 7,318
2024 | ​ |  | 6,158
2025 | ​ |  | 3,947
Thereafter | ​ |  | 23,565
Total | ​ | $ | 61,531

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