Derivatives (Schedule of Derivatives Outstanding) (Details)	3 Months Ended
	Mar. 31, 2017 $ / Unit MMBTU bbl
Swap [Member] | Apr'17 - Oct'17 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member]
Derivative [Line Items]
Weighted average price	3.038
Hedged volume (MMBtu/day) | MMBTU	70,000
Swap [Member] | Nov'17 - Dec'17 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member]
Derivative [Line Items]
Weighted average price	2.960
Hedged volume (MMBtu/day) | MMBTU	60,000
Swap [Member] | Jan'18 - Dec'18 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member]
Derivative [Line Items]
Weighted average price	3.013
Hedged volume (MMBtu/day) | MMBTU	20,000
Basis swap [Member] | Nov'17 - Dec'17 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member]
Derivative [Line Items]
Weighted average price	(0.215)
Hedged volume (MMBtu/day) | MMBTU	20,000
Basis swap [Member] | Jan'18 - Mar'18 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member]
Derivative [Line Items]
Weighted average price	(0.208)
Hedged volume (MMBtu/day) | MMBTU	10,000
Basis swap [Member] | Nov'18 - Dec'18 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member]
Derivative [Line Items]
Weighted average price	(0.208)
Hedged volume (MMBtu/day) | MMBTU	10,000
Collar [Member] | Apr'17 - Oct'17 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member]
Derivative [Line Items]
Hedged volume (MMBtu/day) | MMBTU	20,000
Cap Price	3.10
Floor Price	2.88
Three-way collar [Member] | Apr'17 - Oct'17 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member]
Derivative [Line Items]
Hedged volume (MMBtu/day) | MMBTU	15,000
Cap Price	3.32
Subfloor price	2.00
Floor Price	2.50
Three-way collar [Member] | Apr'17 - Dec'17 [Member] | Crude Oil [Member] | WTI - NYMEX [Member]
Derivative [Line Items]
Hedged volume (Bbl/day) | bbl	3,750
Cap Price	60.98
Subfloor price	39.58
Floor Price	49.79
Three-way collar [Member] | Nov'17 - Dec'17 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member]
Derivative [Line Items]
Hedged volume (MMBtu/day) | MMBTU	25,000
Cap Price	3.59
Subfloor price	2.30
Floor Price	2.90
Three-way collar [Member] | Jan'18 - Mar'18 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member]
Derivative [Line Items]
Hedged volume (MMBtu/day) | MMBTU	60,000
Cap Price	4.07
Subfloor price	2.63
Floor Price	3.29
Three-way collar [Member] | Apr'18 - Dec'18 [Member] | Natural Gas [Member] | IF - NYMEX (HH) [Member]
Derivative [Line Items]
Hedged volume (MMBtu/day) | MMBTU	20,000
Cap Price	3.51
Subfloor price	2.5
Floor Price	3