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Equity Investments (Equity Investments Balance Sheet Disclosure) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Equity Method Investments and Joint Ventures [Abstract] |  |
Current assets | $ 105,537 | $ 181,060
Noncurrent assets | 1,293,925 | 1,306,891
Current liabilities | 56,559 | 114,506
Noncurrent liabilities | $ 155,995 | $ 230,062

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