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Background of companies included in consolidation (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Background of companies included in consolidation [Line Items] |  |  |  |
Assets | $ 4,268,094 | $ 4,296,236 | $ 4,217,980 |
Liabilities | (2,130,292) | (2,048,768) | (1,910,708) |
Equity | 2,137,802 | 2,247,468 | $ 2,307,272 | $ 2,400,356
Parent [Member] |  |  |  |
Background of companies included in consolidation [Line Items] |  |  |  |
Assets | 3,737,892 | 3,658,528 |  |
Liabilities | (1,652,401) | (1,470,707) |  |
Equity | $ 2,085,491 | $ 2,187,821 |  |

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