Derivatives Derivatives (Details 4-Non Hedges Commodity) (Details)	Jun. 30, 2016 BBL / Days MMBTU_per_day $ / bbl $ / MMBTU
Crude Oil Three-Way Collars For Third Quarter of Year 1 [Member]
Derivative [Line Items]
Volume | BBL / Days	47,000
Ceiling Price	55.37
Floor Price	50.23
Sold Put Price	40.96
Crude Oil Three-Way Collars for Fourth Quarter of Year 1
Derivative [Line Items]
Volume | BBL / Days	47,000
Ceiling Price	55.37
Floor Price	50.23
Sold Put Price	40.96
Crude Oil Three-Way Collars For Year 2 [Member]
Derivative [Line Items]
Volume | BBL / Days	0
Ceiling Price	0
Floor Price	0
Sold Put Price	0
Crude Oil Options For the Third Quarter of Year 1 [Member]
Derivative [Line Items]
Volume | BBL / Days	10,000	[1]
Option Price	72.39	[1]
Crude Oil Options For the Fourth Quarter of Year 1 [Member]
Derivative [Line Items]
Volume | BBL / Days	10,000	[1]
Option Price	72.39	[1]
Crude Oil Options For Year 2 [Member]
Derivative [Line Items]
Volume | BBL / Days	35,000	[1]
Option Price	61.91	[1]
Crude Oil Swaps For the Third Quarter of Year 1 [Member]
Derivative [Line Items]
Volume | BBL / Days	10,000
Ceiling Price	50.00
Floor Price	41.55
Crude Oil Swaps For the Fourth Quarter of Year 1 [Member]
Derivative [Line Items]
Volume | BBL / Days	10,000
Ceiling Price	50.00
Floor Price	41.55
Crude Oil Swaps For Year 2 [Member]
Derivative [Line Items]
Volume | BBL / Days	0
Natural Gas Three-Way Collars For the Third Quarter of Year 1 [Member]
Derivative [Line Items]
Volume | MMBTU_per_day	20,000	[2]
Ceiling Price | $ / MMBTU	2.93	[2]
Floor Price | $ / MMBTU	2.50	[2]
Sold Put Price | $ / MMBTU	2.00	[2]
Natural Gas Three-Way Collars For the Fourth Quarter of Year 1 [Member]
Derivative [Line Items]
Volume | MMBTU_per_day	20,000	[2]
Ceiling Price | $ / MMBTU	2.93	[2]
Floor Price | $ / MMBTU	2.50	[2]
Sold Put Price | $ / MMBTU	2.00	[2]
Natural Gas Three-Way Collars For Year 2 [Member]
Derivative [Line Items]
Volume | MMBTU_per_day	40,000	[2]
Ceiling Price | $ / MMBTU	3.28	[2]
Floor Price | $ / MMBTU	2.75	[2]
Sold Put Price | $ / MMBTU	2.25	[2]
Swaption [Member]
Derivative [Line Items]
Swap Price	2.93
Volume | MMBTU_per_day	20,000

[1] Call options settle monthly.

[2] On our 2016 collars, the counterparty has the option to execute fixed-price swaps (swaptions) at a weighted average price of $2.93 per MMBtu indexed to NYMEX Henry Hub, which is exercisable on December 22, 2016. If counterparty exercises, the term of the fixed-price swaps would be for the calendar year 2017 and, if all such options are exercised, 20,000 MMBtu per day.