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Long-term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Sep. 15, 2016
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Less: unamortized deferred financing costs on senior unsecured notes | $ (29,000) |  |
Total long-term debt | 2,097,606 | $ 2,297,214 |
OMP Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Long-term line of credit | 78,000 |  |
Senior unsecured notes |  |  |
Debt Instrument [Line Items] |  |  |
Total principal of senior unsecured notes | 2,052,950 | 2,052,950 |
Less: unamortized deferred financing costs on senior unsecured notes | (22,956) | (28,268) |
Senior unsecured notes | 7.25% senior unsecured notes due February 1, 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Total principal of senior unsecured notes | 54,275 | 54,275 |
Senior unsecured notes | 6.5% senior unsecured notes due November 1, 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Total principal of senior unsecured notes | 395,501 | 395,501 |
Senior unsecured notes | 6.875% senior unsecured notes due March 15, 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Total principal of senior unsecured notes | 937,080 | 937,080 |
Senior unsecured notes | 6.875% senior unsecured notes due January 15, 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Total principal of senior unsecured notes | 366,094 | 366,094 |
Senior unsecured notes | 2.625% senior unsecured convertible notes due September 15, 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Total principal of senior unsecured notes | 300,000 | 300,000 |
Less: unamortized debt discount on senior unsecured convertible notes | $ (80,388) | (90,468) | $ (93,200)
Oasis Credit Facility | Oasis Credit Facility | Oasis Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Total principal of senior unsecured notes |  | 363,000 |
Oasis Credit Facility | Oasis Credit Facility | OMP Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Total principal of senior unsecured notes |  | $ 0 |

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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/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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- Definition Amount, after accumulated amortization, of debt discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a 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. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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