Commitments and Contingencies - Other Matters (Details)		3 Months Ended	12 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) a	Dec. 31, 2015 USD ($) a	Dec. 31, 2014 a
Loss Contingencies [Line Items]
Environmental Reserve and Restoration Cost Accrual			$ 1,505,757	$ 2,405,635
Estimated restoration costs				1,700,000
Mitigation Activities [Member]
Loss Contingencies [Line Items]
Environmental reserve accrued			$ 0
Area of real estate property | a			54.7
Definitive Sales Contracts [Member]
Loss Contingencies [Line Items]
Cost of pursuing strategic alternatives			$ 229,000
Environmental Restoration Costs [Member]
Loss Contingencies [Line Items]
Accrued Penalties				187,500
Environmental Reserve, Wetlands Mitigation and Restoration Costs [Member]
Loss Contingencies [Line Items]
Environmental reserve accrued			1,100,000	$ 1,700,000
Area of real estate property | a				148.4
Estimated restoration costs	$ 2,000,000	$ 2,000,000	1,100,000
Increase in accrual of restoration Costs		300,000	325,000
Funded on estimated costs		$ 935,000	$ 935,000
Anticipated costs change, term			1 year
Environmental Reserve, Wetlands Mitigation and Restoration Costs [Member] | Minimum [Member]
Loss Contingencies [Line Items]
Estimated restoration costs				$ 1,700,000
Environmental Reserve, Wetlands Mitigation and Restoration Costs [Member] | Maximum [Member]
Loss Contingencies [Line Items]
Estimated restoration costs				$ 1,900,000
Land [Member]
Loss Contingencies [Line Items]
Area of real estate property | a			9,800		99.7