Derivative Instruments and Hedging Activities - Hedging Positions (Details)	3 Months Ended
	Mar. 31, 2017 bbl / mo $ / bbl $ / MMBTU
Oil | Swaps | Minimum
Hedging Positions
Exercise price (in dollars per barrel)	44.60
Offset exercise price (in dollars per barrel)	42.00
Net barrels per month (in barrels per month) | bbl / mo	20,000
Oil | Swaps | Maximum
Hedging Positions
Exercise price (in dollars per barrel)	86.85
Offset exercise price (in dollars per barrel)	47.65
Net barrels per month (in barrels per month) | bbl / mo	181,000
Oil | Swaps | Weighted Average
Hedging Positions
Exercise price (in dollars per barrel)	57.85
Offset exercise price (in dollars per barrel)	46.28
Net barrels per month (in barrels per month) | bbl / mo	81,978
Oil | Collars | Minimum
Hedging Positions
Net barrels per month (in barrels per month) | bbl / mo	65,000
Oil | Collars | Maximum
Hedging Positions
Net barrels per month (in barrels per month) | bbl / mo	73,000
Oil | Collars | Weighted Average
Hedging Positions
Net barrels per month (in barrels per month) | bbl / mo	67,500
Natural gas | Swaps | Minimum
Hedging Positions
Exercise price (in dollars per mmbtu) | $ / MMBTU	2.78
Offset exercise price (in dollars per mmbtu)	2.80
Net mmbtu per month (in mmbtu per month)	300,000
Natural gas | Swaps | Maximum
Hedging Positions
Exercise price (in dollars per mmbtu) | $ / MMBTU	4.67
Offset exercise price (in dollars per mmbtu)	2.92
Net mmbtu per month (in mmbtu per month)	1,890,000
Natural gas | Swaps | Weighted Average
Hedging Positions
Exercise price (in dollars per mmbtu) | $ / MMBTU	3.34
Offset exercise price (in dollars per mmbtu)	2.81
Net mmbtu per month (in mmbtu per month)	1,108,000
Natural gas | Collars | Minimum
Hedging Positions
Net barrels per month (in barrels per month) | bbl / mo	950,000
Natural gas | Collars | Maximum
Hedging Positions
Net barrels per month (in barrels per month) | bbl / mo	1,050,000
Natural gas | Collars | Weighted Average
Hedging Positions
Net barrels per month (in barrels per month) | bbl / mo	990,833
Natural gas liquids | Swaps | Minimum
Hedging Positions
Exercise price (in dollars per barrel)	18.06
Net barrels per month (in barrels per month) | bbl / mo	115,000
Natural gas liquids | Swaps | Maximum
Hedging Positions
Exercise price (in dollars per barrel)	72.52
Net barrels per month (in barrels per month) | bbl / mo	145,000
Natural gas liquids | Swaps | Weighted Average
Hedging Positions
Exercise price (in dollars per barrel)	27.95
Net barrels per month (in barrels per month) | bbl / mo	130,952
Puts (floors) | Oil | Collars | Minimum
Hedging Positions
Exercise price (in dollars per barrel)	45.00
Puts (floors) | Oil | Collars | Maximum
Hedging Positions
Exercise price (in dollars per barrel)	50.00
Puts (floors) | Oil | Collars | Weighted Average
Hedging Positions
Exercise price (in dollars per barrel)	48.52
Puts (floors) | Natural gas | Collars | Minimum
Hedging Positions
Exercise price (in dollars per mmbtu)	2.55
Puts (floors) | Natural gas | Collars | Maximum
Hedging Positions
Exercise price (in dollars per mmbtu)	2.55
Puts (floors) | Natural gas | Collars | Weighted Average
Hedging Positions
Exercise price (in dollars per mmbtu)	2.55
Calls (ceilings) | Oil | Collars | Minimum
Hedging Positions
Exercise price (in dollars per barrel)	56.60
Calls (ceilings) | Oil | Collars | Maximum
Hedging Positions
Exercise price (in dollars per barrel)	61.00
Calls (ceilings) | Oil | Collars | Weighted Average
Hedging Positions
Exercise price (in dollars per barrel)	59.64
Calls (ceilings) | Natural gas | Collars | Minimum
Hedging Positions
Exercise price (in dollars per mmbtu)	3.08
Calls (ceilings) | Natural gas | Collars | Maximum
Hedging Positions
Exercise price (in dollars per mmbtu)	3.41
Calls (ceilings) | Natural gas | Collars | Weighted Average
Hedging Positions
Exercise price (in dollars per mmbtu)	3.19