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Assets Held-for-Sale and Discontinued Operations (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets held-for-sale |  |
Assets held for sale | $ 35,963 | $ 37,052
Oil and Gas | Assets Held-for-sale |  |
Assets held-for-sale |  |
Assets held for sale | $ 24,800 | $ 25,900

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