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Assets Held-for-Sale and Discontinued Operations (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Assets held-for-sale |  |
Assets held for sale | $ 37,275 | $ 76,668
Oil and Gas | Assets Held-for-sale |  |
Assets held-for-sale |  |
Assets held for sale | $ 26,100 | $ 65,000

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