Held for Sale (Assets and Liabilities of Properties Held for Sale) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Assets Held for Sale [Abstract]
Assets	$ 5	$ 14
Liabilities Held for Sale [Abstract]
Accrued interest	1,163	5,228
Liabilities	1,163	5,295
Disposal Group, Held-for-sale, Not Discontinued Operations
Assets Held for Sale [Abstract]
Property and equipment	6,301	6,301
Other intangible assets	1,681	1,681
Assets	29,867	30,377
Liabilities Held for Sale [Abstract]
Accrued interest	44	0
Earnest money deposits	415	0
Other liabilities	0	103
Liabilities	459	103
Real Estate | Disposal Group, Held-for-sale, Not Discontinued Operations
Assets Held for Sale [Abstract]
Property and equipment	20,070	19,931
Timber Properties | Disposal Group, Held-for-sale, Not Discontinued Operations
Assets Held for Sale [Abstract]
Property and equipment	1,666	1,682
Oil and Gas Properties | Disposal Group, Held-for-sale, Not Discontinued Operations
Assets Held for Sale [Abstract]
Property and equipment	$ 149	$ 782