Commitments and Contingencies (Details)	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2016 USD ($) Lawsuit	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Estimated expenses and liabilities [Abstract]
Estimated expenses and liabilities	$ 2,452,000	$ 2,452,000	$ 2,086,000
Medical Accrual [Abstract]
Accrued medical claims	2,141,000	2,141,000	1,107,000
Umbrella insurance coverage	$ 2,000,000	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	100,000
Aggregate medical claims for umbrella insurance coverage per calendar year	$ 4,500,000	$ 4,500,000	$ 4,500,000