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Intangible Assets and Liabilities Estimated Future Annual Amortization Expense (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Intangible Assets [Abstract] |  |
2019 (amount remaining at June 30, 2019) | $ 36,345 |
2020 | 53,126 |
2021 | 37,772 |
2022 | 27,407 |
2023 | 19,825 |
Beyond 2023 | 47,292 |
Total intangible assets subject to amortization (accretion) | 221,767 | $ 254,483
2019 (amount remaining at June 30, 2019) | (4,117) |
2020 | (8,028) |
2021 | (1,963) |
2022 | (459) |
2023 | 0 |
Beyond 2023 | 0 |
Intangible liabilities, Net | (14,567) | $ (18,683)
2019 (amount remaining at June 30, 2019) | 32,228 |
2020 | 45,098 |
2021 | 35,809 |
2022 | 26,948 |
2023 | 19,825 |
Beyond 2023 | 47,292 |
Total intangible assets (liabilities), net | $ 207,200 |

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