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Assets Held for Sale and Discontinued Operations - Assets Held for Sale (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Assets held-for-sale |  |
Assets held for sale | $ 76,668 | $ 75,678
Oil and Gas | Assets Held-for-sale |  |
Assets held-for-sale |  |
Assets held for sale | $ 65,000 | $ 73,600

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