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Recent Accounting Developments - ASUs Implemented (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle |  |  |
Accumulated deficit | $ (2,401,988) |  | $ (2,244,877)
ASU 2016-13 |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted |  | true |
ASU 2016-13 | Cumulative Effect, Period of Adoption, Adjustment |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |
Accumulated deficit |  |  | $ (200)
ASU 2018-13 |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted |  | true |
ASU 2019-12 |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted |  | true |

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