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Long-Term Debt (Tables) |  |  | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Jun. 17, 2020 | Sep. 30, 2020
Debt Disclosure [Abstract] |  |  |
Schedule of Long-term Debt Instruments [Table Text Block] |  |  | The following table summarizes the Company’s total outstanding balance on its revolving credit facility, Senior Secured Notes net of unamortized discount and deferred financing costs, and Senior Unsecured Notes, net of unamortized deferred financing costs, as of September 30, 2020, and December 31, 2019:
| As of September 30, 2020 |  | As of December 31, 2019
| (in thousands)
Revolving credit facility | $ | 178,000 |  |  | $ | 122,500 |
Senior Secured Notes (1) | 457,391 |  |  | — |
Senior Unsecured Notes (1) | 1,717,647 |  |  | 2,610,298 |
Total | $ | 2,353,038 |  |  | $ | 2,732,798 |
____________________________________________ (1) Senior Secured Notes and Senior Unsecured Notes have been defined below.
Schedule of Long-Term Debt Instruments, Old Notes Tendered [Table Text Block] |  | The following table summarizes the principal amounts of the Old Notes tendered as of the Settlement Date:
Title of Old Notes Tendered |  | Principal Amount of Old Notes Tendered
|  | (in thousands)
1.50% Senior Convertible Notes due 2021 |  | $ | 107,015 |
6.125% Senior Notes due 2022 |  | 141,701
5.0% Senior Notes due 2024 |  | 155,339
5.625% Senior Notes due 2025 |  | 150,882
6.75% Senior Notes due 2026 |  | 80,765
6.625% Senior Notes due 2027 |  | 83,209
Total |  | $ | 718,911 |
Schedule of Borrowing Base Utilization [Table Text Block] |
Borrowing Base Utilization Percentage | <25% |  | ≥25% <50% |  | ≥50% <75% |  | ≥75% <90% |  | ≥90%
Eurodollar Loans (1) | 1.750 | % |  | 2.000 | % |  | 2.500 | % |  | 2.750 | % |  | 3.000 | %
ABR Loans or Swingline Loans | 0.750 | % |  | 1.000 | % |  | 1.500 | % |  | 1.750 | % |  | 2.000 | %
Commitment Fee Rate | 0.375 | % |  | 0.375 | % |  | 0.500 | % |  | 0.500 | % |  | 0.500 | %
____________________________________________ (1) The Credit Agreement specifies that if LIBOR is no longer a widely used benchmark rate, or if it is no longer used for determining interest rates for loans in the United States, a replacement interest rate that fairly reflects the cost to the lenders of funding loans shall be established by the Administrative Agent, as defined in the Credit Agreement, in consultation with the Company. Please refer to Note 1 - Summary of Significant Accounting Policies for discussion of FASB ASU 2020-04, which provides guidance related to reference rate reform. |  |
Schedule of Line of Credit Facilities [Table Text Block] |  |  | The following table presents the outstanding balance, total amount of letters of credit outstanding, and available borrowing capacity under the Credit Agreement as of October 21, 2020, September 30, 2020, and December 31, 2019:
| As of October 21, 2020 |  | As of September 30, 2020 |  | As of December 31, 2019
| (in thousands)
Revolving credit facility (1) | $ | 129,000 |  |  | $ | 178,000 |  |  | $ | 122,500 |
Letters of credit (2) | 42,000 |  |  | 42,000 |  |  | — |
Available borrowing capacity | 929,000 |  |  | 880,000 |  |  | 1,077,500 |
Total aggregate lender commitment amount | $ | 1,100,000 |  |  | $ | 1,100,000 |  |  | $ | 1,200,000 |
____________________________________________ (1) Unamortized deferred financing costs attributable to the revolving credit facility are presented as a component of the other noncurrent assets line item on the accompanying balance sheets and totaled $4.7 million and $5.9 million as of September 30, 2020, and December 31, 2019, respectively. These costs are being amortized over the term of the revolving credit facility on a straight-line basis. (2) Letters of credit outstanding reduce the amount available under the credit facility on a dollar-for-dollar basis.
Schedule Of Long-term Debt Instruments, Senior Secured Notes [Table Text Block] |  |  | Senior Secured Notes, net of unamortized discount and deferred financing costs, included within the Senior Notes, net line item on the accompanying balance sheets as of September 30, 2020, consisted of the following:
| As of September 30, 2020
| Principal Amount |  | Unamortized Debt Discount |  | Unamortized Deferred Financing Costs |  | Principal Amount, Net
| (in thousands)
10.0% Senior Secured Notes due 2025 | $ | 446,675 |  |  | $ | (39,706) |  |  | $ | (12,091) |  |  | $ | 394,878 |
1.50% Senior Secured Convertible Notes due 2021 (1) | 65,485 |  |  | (2,710) |  |  | (262) |  |  | 62,513 |
Total | $ | 512,160 |  |  | $ | (42,416) |  |  | $ | (12,353) |  |  | $ | 457,391 |
____________________________________________ (1) As discussed above, as required by the 2021 Notes Indenture and as permitted by the Credit Agreement, as the Company issued Permitted Second Lien Debt upon the closing of the Exchange Offers, its remaining 2021 Senior Convertible Notes contemporaneously became secured.
Schedule Of Long-term Debt Instruments, Senior Unsecured Notes [Table Text Block] |  |  | Senior Unsecured Notes, net of unamortized deferred financing costs, included within the Senior Notes, net line item on the accompanying balance sheets as of September 30, 2020, and December 31, 2019, consisted of the following:
| As of September 30, 2020 |  | As of December 31, 2019
| Principal Amount |  | Unamortized Deferred Financing Costs |  | Principal Amount, Net |  | Principal Amount |  | Unamortized Deferred Financing Costs |  | Principal Amount, Net
| (in thousands)
6.125% Senior Notes due 2022 | $ | 231,881 |  |  | $ | 1,055 |  |  | $ | 230,826 |  |  | $ | 476,796 |  |  | $ | 2,920 |  |  | $ | 473,876 |
5.0% Senior Notes due 2024 | 315,633 |  |  | 1,941 |  |  | 313,692 |  |  | 500,000 |  |  | 3,766 |  | 496,234
5.625% Senior Notes due 2025 | 349,118 |  |  | 2,950 |  |  | 346,168 |  |  | 500,000 |  |  | 4,903 |  | 495,097
6.75% Senior Notes due 2026 | 419,235 |  |  | 4,145 |  |  | 415,090 |  |  | 500,000 |  |  | 5,571 |  | 494,429
6.625% Senior Notes due 2027 | 416,791 |  |  | 4,920 |  |  | 411,871 |  |  | 500,000 |  |  | 6,601 |  | 493,399
1.50% Senior Convertible Notes due 2021 (1)(2) | — |  |  | — |  |  | — |  |  | 172,500 |  |  | 15,237 |  |  | 157,263
Total | $ | 1,732,658 |  |  | $ | 15,011 |  |  | $ | 1,717,647 |  |  | $ | 2,649,296 |  |  | $ | 38,998 |  |  | $ | 2,610,298 |
____________________________________________ (1) Unamortized deferred financing costs attributable to the 2021 Senior Convertible Notes include $13.9 million related to the unamortized debt discount as of December 31, 2019. (2) As discussed above, as required by the 2021 Notes Indenture and as permitted by the Credit Agreement, as the Company issued Permitted Second Lien Debt upon the closing of the Exchange Offers, its remaining 2021 Senior Convertible Notes contemporaneously became secured.

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28541-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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