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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
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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