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Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Total long-term debt | $ 2,791,333 | $ 2,735,276
Credit Facility | Revolving Credit Facility | Oasis Credit Facility |  |
Debt Instrument [Line Items] |  |
Total principal of senior unsecured notes and revolving line of credit | 493,000 | 468,000
Credit Facility | Revolving Credit Facility | OMP Credit Facility |  |
Debt Instrument [Line Items] |  |
Total principal of senior unsecured notes and revolving line of credit | 345,000 | 318,000
Senior Notes |  |
Debt Instrument [Line Items] |  |
Total principal of senior unsecured notes and revolving line of credit | 2,039,409 | 2,039,409
Less: unamortized deferred financing costs on senior unsecured notes | $ (19,692) | (20,865)
Senior Notes | 6.50% senior unsecured notes due November 1, 2021 |  |
Debt Instrument [Line Items] |  |
Stated interest rate (as percent) | 6.50% |
Total principal of senior unsecured notes and revolving line of credit | $ 71,835 | 71,835
Senior Notes | 6.875% senior unsecured notes due March 15, 2022 |  |
Debt Instrument [Line Items] |  |
Stated interest rate (as percent) | 6.875% |
Total principal of senior unsecured notes and revolving line of credit | $ 901,480 | 901,480
Senior Notes | 6.875% senior unsecured notes due January 15, 2023 |  |
Debt Instrument [Line Items] |  |
Stated interest rate (as percent) | 6.875% |
Total principal of senior unsecured notes and revolving line of credit | $ 366,094 | 366,094
Senior Notes | 6.25% senior unsecured notes due May 1, 2026 |  |
Debt Instrument [Line Items] |  |
Stated interest rate (as percent) | 6.25% |
Total principal of senior unsecured notes and revolving line of credit | $ 400,000 | 400,000
Senior Notes | 2.625% senior unsecured convertible notes due September 15, 2023 |  |
Debt Instrument [Line Items] |  |
Stated interest rate (as percent) | 2.625% |
Total principal of senior unsecured notes and revolving line of credit | $ 300,000 | 300,000
Less: unamortized debt discount on senior unsecured convertible notes | (66,384) | $ (69,268)
Total long-term debt | $ 300,000 |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: 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=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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