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Other Investments (Summarized Investee Financial Information) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Balance Sheets |  |  |
Total assets | $ 2,118,045 | $ 2,493,798 |
Total liabilities | 1,016,502 | 1,169,125 |
Noncontrolling interests | 2,007 | 13,258 |
Total equity attributable to parent entities | 1,099,536 | 1,311,415 |
Income Statements |  |  |
Revenues | 262,970 | 261,867 | $ 272,281
Expenses | (187,257) | (167,999) | (227,720)
Net income attributable to parent entities | $ 75,056 | $ 91,633 | $ 42,209

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