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Intangible Assets Estimated Future Annual Amortization Expense (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Intangible Assets [Abstract] |  |
2018 (amount remaining at March 31, 2018) | $ 58,564 |
2019 | 72,345 |
2020 | 52,265 |
2021 | 36,649 |
2022 | 26,317 |
Beyond 2022 | 65,244 |
Total intangible assets subject to amortization (accretion) | 311,384 | $ 95,228
2018 (amount remaining at March 31, 2018) | (3,913) |
2019 | (8,233) |
2020 | (8,028) |
2021 | (1,963) |
2022 | (459) |
Beyond 2022 | 0 |
Finite-Lived Intangible Liabilities, Net | (22,596) | $ 0
2018 (amount remaining at March 31, 2018) | 54,651 |
2019 | 64,112 |
2020 | 44,237 |
2021 | 34,686 |
2022 | 25,858 |
Beyond 2022 | 65,244 |
Total intangible assets subject to amortization (accretion) | $ 288,788 |

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