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Fair Value Measurements (Tables) | 12 Months Ended
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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.

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=117815213&loc=SL7498348-110258 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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