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Summary of Significant Accounting Policies impact of recently issued accounting standards (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Effect of new accounting principles |  | $ (35,935) | $ 0
Retained Earnings |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Effect of adoption of ASU No. 2016-13 (Note 1) | $ 47,011 |  |
Effect of new accounting principles |  | $ (35,935) | $ 22,354

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