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Intangible Assets and Liabilities - Estimated Future Annual Amortization Expense (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |
2019 Amortization | $ 72,512 |
2019 Accretion | (8,233) |
2019 Amortization, net | 64,279 |
2020 Amortization | 52,591 |
2020 Accretion | (8,028) |
2020 Amortization, net | 44,563 |
2021 Amortization | 37,124 |
2021 Accretion | (1,963) |
2021 Amortization, net | 35,161 |
2022 Amortization | 26,950 |
2022 Accretion | (459) |
2022 Amortization, net | 26,491 |
2023 Amortization | 19,363 |
2023 Accretion | 0 |
2023 Amortization, net | 19,363 |
Beyond 2023 | 45,943 |
Beyond 2023 Accretion | 0 |
Beyond 2023 Amortization, net | 45,943 |
Total intangible assets subject to amortization | 254,483 | $ 95,228
Finite-lived intangible liabilities, net | (18,683) | $ 0
Finite-lived intangible assets (liabilities), net | $ 235,800 |

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