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Total Capital and Net Income Per Unit Common Unit Repurchases (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 34 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2021
Accelerated Share Repurchases [Line Items] |  |  |  |
Partners' Capital Account, Treasury Units, Purchased |  | $ 15,635,000 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  | $ 55,800,000
Repurchase Agreements [Member] | Common Units |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  | $ 100,000,000
Partners' Capital Account, Units, Treasury Units Purchased |  |  | 1,400,000 |
General Partner |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |
Partners' Capital Account, Treasury Units, Purchased |  | $ 313,000 |  |
General Partner | Repurchase Agreements [Member] | Common Units |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |
Partners' Capital Account, Treasury Units, Purchased |  |  | $ 300,000 |
Limited Partners | Common Units |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |
Partners' Capital Account, Units, Treasury Units Purchased | 23,000 | (1,373,000) |  |
Partners' Capital Account, Treasury Units, Purchased |  | $ 15,322,000 |  |
Limited Partners | Repurchase Agreements [Member] | Common Units |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |
Partners' Capital Account, Units, Treasury Units Purchased |  |  |  | 3,600,000
Partners' Capital Account, Treasury Units, Purchased |  |  | $ 15,300,000 | $ 44,200,000

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- Definition Units that were previously issued and have been repurchased during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB TOPIC 4.F) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187171-122770 + Details
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