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Equity Investments (Equity Investments Balance Sheet Disclosure) (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
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Equity Method Investments and Joint Ventures [Abstract] |  |
Current assets | $ 105,614 | $ 105,537
Noncurrent assets | 1,330,877 | 1,293,925
Current liabilities | 41,238 | 56,559
Noncurrent liabilities | $ 146,642 | $ 155,995

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