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Intangible Assets and Liabilities Estimated Future Annual Amortization Expense (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Intangible Assets [Abstract] |  |
2018 (amount remaining at June 30, 2018) | $ 38,786 |
2019 | 72,012 |
2020 | 52,076 |
2021 | 36,469 |
2022 | 26,282 |
Beyond 2022 | 64,753 |
Total intangible assets subject to amortization (accretion) | 290,378 | $ 95,228
2018 (amount remaining at June 30, 2018) | (2,609) |
2019 | (8,233) |
2020 | (8,028) |
2021 | (1,963) |
2022 | (458) |
Beyond 2022 | 0 |
Intangible liabilities, Net | (21,291) | $ 0
2018 (amount remaining at June 30, 2018) | 36,177 |
2019 | 63,779 |
2020 | 44,048 |
2021 | 34,506 |
2022 | 25,824 |
Beyond 2022 | 64,753 |
Total intangible assets (liabilities), net | $ 269,087 |

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