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Assets Held for Sale and Discontinued Operations - Assets Held for Sale (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Assets held-for-sale |  |
Assets held for sale | $ 37,052 | $ 76,668
Oil and Gas | Assets Held-for-sale |  |
Assets held-for-sale |  |
Assets held for sale | $ 25,900 | $ 65,000

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