Derivative Instruments and Hedging Activities (Schedule of Outstanding Oil and Natural Gas Derivative Contracts) (Details) - Not Designated as Hedging Instrument [Member] MMBTU in Thousands	1 Months Ended	3 Months Ended
	May 02, 2017 MMBTU $ / MMBTU	Mar. 31, 2017 MMBTU $ / MMBTU $ / bbl MBbls
Crude Oil [Member] | Swap [Member]
Derivative [Line Items]
Total volume | MBbls		550
Swap Contracts Combined with Short Puts (WTI, Enhanced Swaps) for Full Year of 2017 [Member] | Crude Oil [Member] | Put Option [Member] | Short [Member]
Derivative [Line Items]
Strike price		30.00
Swap Contracts Combined with Short Puts (WTI, Enhanced Swaps) for Full Year of 2017 [Member] | Crude Oil [Member] | Swap [Member]
Derivative [Line Items]
Average swap price		44.50
Deferred Premium Put Option for Full Year of 2017 [Member] | Crude Oil [Member] | Put Option [Member]
Derivative [Line Items]
Total volume | MBbls		250
Average swap price		2.05
Deferred Premium Put Option for Full Year of 2017 [Member] | Crude Oil [Member] | Put Option [Member] | Long [Member]
Derivative [Line Items]
Strike price		50.00
Deferred Premium Put Spread Option for Full Year of 2017 [Member] | Crude Oil [Member]
Derivative [Line Items]
Total volume | MBbls		506
Average swap price		2.45
Deferred Premium Put Spread Option for Full Year of 2017 [Member] | Crude Oil [Member] | Put Option [Member] | Long [Member]
Derivative [Line Items]
Strike price		50.00
Deferred Premium Put Spread Option for Full Year of 2017 [Member] | Crude Oil [Member] | Put Option [Member] | Short [Member]
Derivative [Line Items]
Strike price		40.00
Collar Contracts (WTI, Two-Way Collars) for Full Year of 2017 [Member] | Crude Oil [Member] | Call Option [Member] | Short [Member]
Derivative [Line Items]
Total volume | MBbls		1,018
Strike price		58.19
Collar Contracts (WTI, Two-Way Collars) for Full Year of 2017 [Member] | Crude Oil [Member] | Put Option [Member] | Long [Member]
Derivative [Line Items]
Strike price		47.50
Call Option Contracts (Short Position) for Full Year of 2017 [Member] | Crude Oil [Member] | Call Option [Member]
Derivative [Line Items]
Strike price		50.00
Call Option Contracts (Short Position) for Full Year of 2017 [Member] | Crude Oil [Member] | Call Option [Member] | Short [Member]
Derivative [Line Items]
Total volume | MBbls		505
Swap Contracts Differentials (Midland Basis Differential) for Full Year of 2017 [Member] [Member] | Crude Oil [Member]
Derivative [Line Items]
Total volume | MBbls		1,650
Average swap price		(0.52)
Swap Contracts Differentials (Midland Basis Differential) for Full Year of 2018 [Member] [Member] | Crude Oil [Member]
Derivative [Line Items]
Total volume | MBbls		2,008
Average swap price		(1.02)
Collar Contracts Combined With Short Puts (Henry Hub Three-Way Collars) for Remainder of 2017 [Member] | Natural Gas [Member]
Derivative [Line Items]
Total volume | MMBTU		1,100
Collar Contracts Combined With Short Puts (Henry Hub Three-Way Collars) for Remainder of 2017 [Member] | Natural Gas [Member] | Call Option [Member] | Short [Member]
Derivative [Line Items]
Strike price | $ / MMBTU		3.71
Collar Contracts Combined With Short Puts (Henry Hub Three-Way Collars) for Remainder of 2017 [Member] | Natural Gas [Member] | Put Option [Member] | Long [Member]
Derivative [Line Items]
Strike price | $ / MMBTU		3.00
Collar Contracts Combined With Short Puts (Henry Hub Three-Way Collars) for Remainder of 2017 [Member] | Natural Gas [Member] | Put Option [Member] | Short [Member]
Derivative [Line Items]
Strike price | $ / MMBTU		2.50
Collar Contracts Combined with Short Puts (WTI, Three-Way Collars) for Full Year of 2018 [Member] | Crude Oil [Member]
Derivative [Line Items]
Total volume | MBbls		2,738
Collar Contracts Combined with Short Puts (WTI, Three-Way Collars) for Full Year of 2018 [Member] | Crude Oil [Member] | Call Option [Member] | Short [Member]
Derivative [Line Items]
Strike price		62.84
Collar Contracts Combined with Short Puts (WTI, Three-Way Collars) for Full Year of 2018 [Member] | Crude Oil [Member] | Put Option [Member] | Long [Member]
Derivative [Line Items]
Strike price		50.00
Collar Contracts Combined with Short Puts (WTI, Three-Way Collars) for Full Year of 2018 [Member] | Crude Oil [Member] | Put Option [Member] | Short [Member]
Derivative [Line Items]
Strike price		40.00
Collar Contracts (Henry Hub, Two-Way Collars) for Remainder of 2017 [Member] | Natural Gas [Member]
Derivative [Line Items]
Total volume | MMBTU		1,100
Collar Contracts (Henry Hub, Two-Way Collars) for Remainder of 2017 [Member] | Natural Gas [Member] | Subsequent Event [Member]
Derivative [Line Items]
Total volume | MMBTU	488
Collar Contracts (Henry Hub, Two-Way Collars) for Remainder of 2017 [Member] | Natural Gas [Member] | Call Option [Member] | Short [Member]
Derivative [Line Items]
Strike price | $ / MMBTU		3.68
Collar Contracts (Henry Hub, Two-Way Collars) for Remainder of 2017 [Member] | Natural Gas [Member] | Call Option [Member] | Short [Member] | Subsequent Event [Member]
Derivative [Line Items]
Strike price | $ / MMBTU	3.84
Collar Contracts (Henry Hub, Two-Way Collars) for Remainder of 2017 [Member] | Natural Gas [Member] | Put Option [Member] | Long [Member]
Derivative [Line Items]
Strike price | $ / MMBTU		3.00
Collar Contracts (Henry Hub, Two-Way Collars) for Remainder of 2017 [Member] | Natural Gas [Member] | Put Option [Member] | Long [Member] | Subsequent Event [Member]
Derivative [Line Items]
Strike price | $ / MMBTU	3.40
Collar Contracts (Henry Hub, Two-Way Collars) for Remainder of 2018 [Member] | Natural Gas [Member] | Subsequent Event [Member]
Derivative [Line Items]
Total volume | MMBTU	720
Collar Contracts (Henry Hub, Two-Way Collars) for Remainder of 2018 [Member] | Natural Gas [Member] | Call Option [Member] | Short [Member] | Subsequent Event [Member]
Derivative [Line Items]
Strike price | $ / MMBTU	3.84
Collar Contracts (Henry Hub, Two-Way Collars) for Remainder of 2018 [Member] | Natural Gas [Member] | Put Option [Member] | Long [Member] | Subsequent Event [Member]
Derivative [Line Items]
Strike price | $ / MMBTU	3.40
Swap Contracts for Remainder of 2017 [Member] | Natural Gas [Member] | Subsequent Event [Member]
Derivative [Line Items]
Total volume | MMBTU	736
Average swap price | $ / MMBTU	3.39