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Assets Held-for-Sale and Discontinued Operations (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Assets held-for-sale |  |
Assets held for sale | $ 78,407 | $ 76,668
Oil and Gas | Assets Held-for-sale |  |
Assets held-for-sale |  |
Assets held for sale | $ 67,200 | $ 65,000

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