Commitments and Contingencies (Details)		9 Months Ended	12 Months Ended
		Sep. 30, 2016 USD ($) Lawsuit	Dec. 31, 2015 USD ($)
Estimated expenses and liabilities [Abstract]
Estimated expenses and liabilities	[1]	$ 2,783,000	$ 2,086,000
Medical Accrual [Abstract]
Accrued medical claims		1,839,000	1,107,000
Umbrella insurance coverage		$ 2,000,000
Number of claims alleging subsidence caused by oil and gas production | Lawsuit		1
Total number of law suits | Lawsuit		3
Future legal cost accrued		$ 500,000	500,000
Minimum [Member]
Medical Accrual [Abstract]
Annual individual medical claims for stop loss coverage		100,000
Aggregate medical claims for umbrella insurance coverage per calendar year		$ 4,500,000	$ 4,500,000

[1] Premiums paid and expensed for which possible and anticipated claims that have not been reported and/or fully developed as of the balance sheet date.