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v3.20.2

Summary of significant accounting policies (Details) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
Summary Of Significant Accounting Policies [Line Items] |  |  |
Allowance for credit loss | $ 64,263 |  | $ 0
Decrease to retained earnings | $ (8,232,470) |  | (7,734,609)
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member |  |
Cumulative effect due to adoption of new accounting standard |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Allowance for credit loss |  | $ 30,300 | $ 30,264
Decrease to retained earnings |  | $ 25,800 |

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