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Equity Investments (Equity Investments Balance Sheet Disclosure) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Equity Method Investments and Joint Ventures [Abstract] |  |
Current assets | $ 395,679 | $ 415,032
Noncurrent assets | 2,109,829 | 1,542,090
Current liabilities | 285,521 | 261,086
Noncurrent liabilities | $ 87,259 | $ 148,839

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