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Held for Sale (Assets and Liabilities of Properties Held for Sale) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Assets Held for Sale [Abstract] |  |
Property and equipment | $ 0 | $ 79,733
Assets | 14 | 104,967
Liabilities Held for Sale [Abstract] |  |
Other liabilities | 0 | 1,667
Liabiltiies | 5,295 | $ 11,192
Disposal Group, Held-for-sale, Not Discontinued Operations |  |
Assets Held for Sale [Abstract] |  |
Property and equipment | 6,301 |
Other intangible assets | 1,681 |
Assets | 30,377 |
Liabilities Held for Sale [Abstract] |  |
Other liabilities | 103 |
Liabiltiies | 103 |
Disposal Group, Held-for-sale, Not Discontinued Operations | Real Estate |  |
Assets Held for Sale [Abstract] |  |
Property and equipment | 19,931 |
Disposal Group, Held-for-sale, Not Discontinued Operations | Timber |  |
Assets Held for Sale [Abstract] |  |
Property and equipment | 1,682 |
Disposal Group, Held-for-sale, Not Discontinued Operations | Oil and Gas Properties |  |
Assets Held for Sale [Abstract] |  |
Property and equipment | $ 782 |

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