Derivative Instruments and Hedging Activities (Schedule of Outstanding Oil and Natural Gas Derivative Contracts) (Details) MMBTU in Thousands	1 Months Ended	3 Months Ended
	May. 03, 2016 $ / bbl MBbls	Mar. 31, 2016 MMBTU $ / MMBTU $ / bbl MBbls
Swap Contracts for Remainder of 2016 [Member] | Crude Oil [Member] | Swap [Member]
Derivative [Line Items]
Total volume | MBbls		550
Average swap price		58.23
Swap Contracts for Remainder of 2016 [Member] | Natural Gas [Member] | Swap [Member]
Derivative [Line Items]
Total volume | MMBTU		1,650
Average swap price | $ / MMBTU		2.52
Swap Contracts for Period May Through September 2016 [Member] | Crude Oil [Member] | Swap [Member] | Subsequent Event [Member]
Derivative [Line Items]
Total volume | MBbls	153
Average swap price	57.61
WTI Three-way Collar Contract Covering Period of May Through September 2016 [Member] | Crude Oil [Member] | Subsequent Event [Member]
Derivative [Line Items]
Total volume | MBbls	153
Swap Contracts Differentials for Remainder of 2016 [Member] | Crude Oil [Member] | Swap [Member]
Derivative [Line Items]
Total volume | MBbls		1,100
Average swap price		0.17
Collar Contracts Combined with Short Puts for Remainder of 2016 [Member] | Crude Oil [Member]
Derivative [Line Items]
Total volume | MBbls		550
Collar Contracts Combined with Short Puts for Remainder of 2016 [Member] | Crude Oil [Member] | Call Option [Member] | Short [Member]
Derivative [Line Items]
Strike price		65.00
Collar Contracts Combined with Short Puts for Remainder of 2016 [Member] | Crude Oil [Member] | Put Option [Member] | Long [Member]
Derivative [Line Items]
Strike price		55.00
Collar Contracts Combined with Short Puts for Remainder of 2016 [Member] | Crude Oil [Member] | Put Option [Member] | Short [Member]
Derivative [Line Items]
Strike price		40.33
Collar Contracts for Remainder of 2016 [Member] | Crude Oil [Member]
Derivative [Line Items]
Total volume | MBbls		550
Collar Contracts for Remainder of 2016 [Member] | Crude Oil [Member] | Call Option [Member] | Short [Member]
Derivative [Line Items]
Strike price		46.50
Collar Contracts for Remainder of 2016 [Member] | Crude Oil [Member] | Put Option [Member] | Long [Member]
Derivative [Line Items]
Strike price		37.50
Swap Contracts for Full Year of 2017 [Member] | Crude Oil [Member] | Swap [Member]
Derivative [Line Items]
Total volume | MBbls		730
Average swap price		44.50
Short Put Option Contracts for Full year of 2017 [Member] | Crude Oil [Member] | Put Option [Member] | Short [Member]
Derivative [Line Items]
Total volume | MBbls		730
Strike price		30.00
Short Call Option Contracts for Full Year of 2017 [Member] | Crude Oil [Member] | Call Option [Member] | Short [Member]
Derivative [Line Items]
Total volume | MBbls		670
Strike price		50.00