Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2019

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The following table is a listing of the Company’s assets and liabilities that are measured at fair value in the accompanying balance sheets and where they are classified within the fair value hierarchy as of December 31, 2019:

	Level 1		Level 2		Level 3
	(in thousands)
Assets:
Derivatives (1)	$	—	$	75,808	$	—
Liabilities:
Derivatives (1)	$	—	$	54,290	$	—

____________________________________________

⁽¹⁾  This represents a financial asset or liability that is measured at fair value on a recurring basis.

The following table is a listing of the Company’s assets and liabilities that are measured at fair value in the accompanying balance sheets and where they are classified within the fair value hierarchy as of December 31, 2018:

	Level 1		Level 2		Level 3
	(in thousands)
Assets:
Derivatives (1)	$	—	$	233,629	$	—
Liabilities:
Derivatives (1)	$	—	$	75,349	$	—

____________________________________________

⁽¹⁾ 

This represents a financial asset or liability that is measured at fair value on a recurring basis.

^[1],[2]

Impairment of Oil and Gas Properties [Table Text Block]

The following table presents impairment of proved properties expense and abandonment and impairment of unproved properties expense recorded for the periods presented:

	For the Years Ended December 31,
	2019		2018		2017
	(in millions)
Impairment of proved properties	$	—	$	—	$	3.8
Abandonment and impairment of unproved properties	33.8		49.9		12.3
Impairment of oil and gas properties	$	33.8	$	49.9	$	16.1

Long Term Debt Fair Value [Table Text Block]

The following table reflects the fair value of the Company’s unsecured senior note obligations measured using Level 1 inputs based on quoted secondary market trading prices. These notes were not presented at fair value on the accompanying balance sheets as of December 31, 2019, or 2018, as they were recorded at carrying value, net of any unamortized discounts and deferred financing costs. Please refer to Note 5 – Long-Term Debt for additional discussion.

	As of December 31,
	2019				2018
	Principal Amount		Fair Value		Principal Amount		Fair Value
	(in thousands)
6.125% Senior Notes due 2022	$	476,796	$	481,564	$	476,796	$	452,336
5.0% Senior Notes due 2024	$	500,000	$	479,815	$	500,000	$	439,265
5.625% Senior Notes due 2025	$	500,000	$	475,835	$	500,000	$	436,460
6.75% Senior Notes due 2026	$	500,000	$	494,860	$	500,000	$	448,305
6.625% Senior Notes due 2027	$	500,000	$	493,750	$	500,000	$	442,500
1.50% Senior Convertible Notes due 2021	$	172,500	$	164,430	$	172,500	$	158,614

[1] ⁽¹⁾  This represents a financial asset or liability that is measured at fair value on a recurring basis.

[2] ⁽¹⁾  This represents a financial asset or liability that is measured at fair value on a recurring basis.