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Long-Term Debt - OMP Senior Notes (Details) - USD ($) $ in Thousands |  | 6 Months Ended
--- | --- | ---
Mar. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2020
Debt Instrument [Line Items] |  |  |
Proceeds from issuance of senior unsecured notes |  | $ 850,000 | $ 0
Payments of other fees and expenses | $ 6,100 |  |
Simplification Transaction | OMS Holdings |  |  |
Debt Instrument [Line Items] |  |  |
Cumulative cash distributions | 231,500 |  |
OMP Senior Notes | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | $ 450,000 |  |
Stated interest rate | 8.00% |  |
Proceeds from issuance of senior unsecured notes | $ 442,100 |  |
Debt issuance costs | 9,900 |  |
OMP Senior Notes | Senior Notes | Level 1 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, fair value |  | $ 478,400 |
OMP Credit Facility | Credit Facility | Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of lines of credit | 204,000 |  |
Payments of accrued interest | $ 500 |  |

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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=123466204&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=120400017&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=120391452&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=120398452&loc=d3e534808-122878 + Details
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