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Background of companies included in consolidation(Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Background of companies included in consolidation [Line Items] |  |  |  |
Assets | $ 4,296,236 | $ 4,217,980 | $ 4,643,762 |
Liabilities | 2,048,768 | 1,910,708 | 2,243,406 |
Equity | 2,247,468 | 2,307,272 | $ 2,400,356 | $ 2,292,515
Parent [Member] |  |  |  |
Background of companies included in consolidation [Line Items] |  |  |  |
Assets | 3,658,528 | 3,824,137 |  |
Liabilities | (1,470,707) | (1,578,063) |  |
Equity | $ 2,187,821 | $ 2,246,074 |  |

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