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Summary of Significant Accounting Policies - Deferred Financing Costs (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Accounting Policies [Abstract] |  |
Gross deferred financing costs | $ 144,981 | $ 128,469
Accumulated amortization of deferred financing costs | 58,016 | $ 41,862
Deferred Financing Costs, Amortization Expense, Rolling Maturity [Abstract] |  |
2020 | 17,132 |
2021 | 16,002 |
2022 | 14,888 |
2023 | 11,618 |
2024 | 8,424 |
Thereafter | $ 18,901 |

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