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Intangible Assets, net (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Finite-Lived Intangible Assets | Intangible assets, net consisted of the following (in thousands):
| December 31, 2018 |  | December 31, 2017
| Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization
Customer related (10-25 year life) | $ | 107,008 |  |  | $ | (69,678 | ) |  | $ | 107,008 |  |  | $ | (64,887 | )
Contract based (5-7 year life) | 64,556 |  |  | (49,516 | ) |  | 68,395 |  |  | (41,644 | )
Intangible assets | $ | 171,564 |  |  | $ | (119,194 | ) |  | $ | 175,403 |  |  | $ | (106,531 | )
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | Estimated future intangible amortization expense is as follows (in thousands):
2019 | $ | 13,047 |
2020 | 9,562 |
2021 | 4,687 |
2022 | 3,496 |
2023 | 3,251 |
Thereafter | 18,327 |
Total | $ | 52,370 |

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