Derivative Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2019

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Summary of Open Commodity Derivative Contracts

At March 31, 2019, Company had the following open commodity derivative contracts to manage commodity price risks.

Type/Year	Index	Total Volumes		Weighted Average Price per Unit		Fair Value - March 31, 2019
		(in millions)				Asset (Liability)
Natural gas fixed price swaps		(Mmbtu)		($/Mmbtu)
2019 (April through December)	NYMEX-Henry Hub		137.8	$	2.77	$	(2,079	)
2020	NYMEX-Henry Hub		24.6		2.78		(5,439	)
Natural gas basis swaps (1)		(Mmbtu)		($/Mmbtu)
2019 (April through December)	NW Rockies Basis Swap		90.2	$	0.58	$	(18,734	)
2020	NW Rockies Basis Swap		7.7		0.15		770
Crude oil fixed price swaps		(Bbl)		($/Bbl)
2019 (April through December)	NYMEX-WTI		1.0	$	58.64	$	(1,680	)
2020	NYMEX-WTI		0.1		60.05		51

Type/Year	Index	Total Volumes		Weighted Average Floor Price ($/MMBTU)		Weighted Average Ceiling Price ($/MMBTU)		Fair Value - March 31, 2019
		(in millions)						Asset (Liability)
Natural gas collars		(Mmbtu)
2019 (April through December)	NYMEX		2.8	$	2.85	$	3.13	$	264
2020	NYMEX		49.4	$	2.51	$	2.97	$	(1,298	)
Natural gas deferred premium put options		(Mmbtu)
2020	NYMEX		25.1	$	2.41	N/A		$	(394	)

⁽¹⁾ Represents swap contracts that fix the basis differentials for gas sold at or near Opal, Wyoming and the value of natural gas established on the last trading day of the month by the NYMEX for natural gas swaps for the respective period.

Summary of Pre-tax Realized and Unrealized Gain (Loss) Recognized Related to Derivative Instruments

The following table summarizes the pre-tax realized and unrealized gain (loss) the Company recognized related to its derivative instruments in the Condensed Consolidated Statements of Operations for the three months ended March 31, 2019 and 2018:

	For the Three Months
	Ended March 31,
Commodity Derivatives (in thousands):	2019			2018
Realized gain (loss) on commodity derivatives - natural gas (1)	$	(81,203	)	$	1,446
Realized gain (loss) on commodity derivatives - oil (1)		2,572			(370	)
Unrealized gain (loss) on commodity derivatives (1)		14,292			(7,606	)
Total gain (loss) on commodity derivatives	$	(64,339	)	$	(6,530	)

(1) Included in Loss on commodity derivatives in the Consolidated Statements of Operations.