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Separate information on the main office, parent entity and joint action agreements (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Separate information on the main office, parent entity and joint action agreements [Line Items] |  |  |  |
Assets | $ 4,818,463 | $ 4,684,151 | $ 4,268,094 |
Liabilities | (2,655,885) | (2,549,679) | (2,130,292) |
Equity | 2,162,578 | 2,134,472 | $ 2,137,802 | $ 2,247,468
Parent [Member] |  |  |  |
Separate information on the main office, parent entity and joint action agreements [Line Items] |  |  |  |
Assets | 4,173,308 | 4,069,649 |  |
Liabilities | (2,050,223) | (1,983,382) |  |
Equity | $ 2,123,085 | $ 2,086,267 |  |

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