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Intangible Assets and Liabilities Estimated Future Annual Amortization Expense (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Intangible Assets [Abstract] |  |
2020 (amount remaining at September 30, 2020) | $ 13,252 |
2021 | 37,757 |
2022 | 27,368 |
2023 | 19,778 |
2024 | 15,605 |
Thereafter | 31,128 |
Total intangible assets subject to amortization (accretion) | 144,888 |
2020 (amount remaining at September 30, 2020) | (2,006) |
2021 | (1,963) |
2022 | 459 |
2023 | 0 |
2024 | 0 |
Thereafter | 0 |
Intangible liabilities, Net | (4,428) | $ (10,450)
2020 (amount remaining at September 30, 2020) | 11,246 |
2021 | 35,794 |
2022 | 26,909 |
2023 | 19,778 |
2024 | 15,605 |
Thereafter | 31,128 |
Total intangible assets (liabilities), net | $ 140,460 |

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