Related Party Transactions - Narrative (Details)	1 Months Ended
	Feb. 28, 2015 USD ($) a	Dec. 31, 2010 USD ($) $ / bbl	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Related Party Transaction [Line Items]
Receivables from employees			$ 26,000	$ 34,000
Darle Vuelta Cattle Co LLC
Related Party Transaction [Line Items]
Area of land purchased (in acres) | a	100
Payment to acquire land	$ 1,500,000
Darle Vuelta Cattle Co LLC | Salt Water Disposal Well
Related Party Transaction [Line Items]
Price of oil and gas waste per barrel (dollars per barrel) | $ / bbl		0.10
Price of brine or fresh water per barrel (dollars per barrel) | $ / bbl		0.05
Monthly payment on leases		$ 5,000