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Intangible Assets and Liabilities Estimated Future Annual Amortization Expense (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Intangible Assets [Abstract] |  |
2020 (amount remaining at March 31, 2020) | $ 39,618 |
2021 | 37,572 |
2022 | 27,212 |
2023 | 19,674 |
2024 | 15,523 |
Thereafter | 31,211 |
Total intangible assets subject to amortization (accretion) | 170,810 |
2020 (amount remaining at March 31, 2020) | (6,020) |
2021 | (1,963) |
2022 | (459) |
2023 | 0 |
2024 | 0 |
Thereafter | 0 |
Intangible liabilities, Net | (8,442) | $ (10,450)
2020 (amount remaining at March 31, 2020) | 33,598 |
2021 | 35,609 |
2022 | 26,753 |
2023 | 19,674 |
2024 | 15,523 |
Thereafter | 31,211 |
Total intangible assets (liabilities), net | $ 162,368 |

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