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Equity Investees (Schedule of Balance Sheet Information for Equity Investees) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets |  |
Current assets | $ 34,381 | $ 35,375
Fixed assets, net | 362,214 | 365,563
Other assets | 14,927 | 3,177
Total assets | 411,522 | 404,115
Liabilities and equity |  |
Current liabilities | 23,289 | 23,928
Other liabilities | 249,610 | 230,327
Equity | 138,623 | 149,860
Total liabilities and equity | $ 411,522 | $ 404,115

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