Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Schedule of Fair Value Measurements on Nonrecurring Basis

	Level 1		Level 2		Level 3		Net Book Value		Total Pre-tax (Non-cash) Impairment Loss
Proved oil and gas properties at cost, net of impairment		—		—	$	315,138	$	3,386,585	$	3,071,447
Unevaluated oil and gas properties at cost, net of impairment		—		—	$	154,783	$	314,336	$	159,553
Gas gathering system (1)		—		—		—		56,648	$	56,648