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Equity Investees (Consolidated Financial Statements Related to Equity Investees) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Equity Method Investments and Joint Ventures [Abstract] |  |  |
Genesis’ share of operating earnings | $ 59,255 | $ 66,814 | $ 63,805
Amortization of differences attributable to Genesis' carrying value of equity investments | (15,629) | (15,768) | (15,861)
Net equity in earnings | 43,626 | 51,046 | 47,944
Distributions received | $ 71,714 | $ 82,898 | $ 87,220

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