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Subsequent Events	6 Months Ended
	Jun. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events The Company has evaluated the period after the balance sheet date, noting no subsequent events or transactions that required recognition or disclosure in the financial statements, other than as noted below. Derivative instruments. In July and August 2017, the Company entered into new swaps and two-way costless collar options for crude oil which settle based on WTI. The commodity contracts included a total notional amount of 244,000 barrels with a weighted average floor price of $49.43 per barrel which settle in 2017, 2,915,000 barrels with a weighted average floor price of $48.59 per barrel which settle in 2018, and 248,000 barrels with a weighted average floor price of $48.49 per barrel which settle in 2019. These derivative instruments do not qualify for or were not designated as hedging instruments for accounting purposes.

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No definition available.

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

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