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Other Investments (Summarized financial information) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Investments, All Other Investments [Abstract] |  |  |
Total assets | $ 2,803,411 | $ 3,597,587 |
Total liabilities | 683,079 | 768,622 |
Noncontrolling interests | 23,544 | 19,208 |
Total equity | 2,096,788 | 2,809,757 |
Revenues | 272,281 | 481,224 | $ 626,039
Expenses | (227,720) | (245,968) | (185,603)
Net income attributable to parent entities | $ 42,209 | $ 234,529 | $ 440,210

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