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Partners' Capital, Mezzanine Capital and Distributions (Redeemable Noncontrolling Interest - Narrative) (Details) - USD ($) |  | 3 Months Ended
--- | --- | ---
Sep. 23, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Redeemable Noncontrolling Interest [Line Items] |  |  |
Proceeds from redeemable noncontrolling interest |  | $ 122,900,000 |
Redeemable noncontrolling interest redemption value adjustments |  | (4,086,000) | $ 0
Redemption accretion of redeemable preferred noncontrolling interest |  | 792,000 |
Subsidiary | Alkali Holdings |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |
Issuance of redeemable noncontrolling interest | $ 55,000,000 | 130,000,000 |
Facility expansion costs percentage | 100.00% |  |
Period for occurrence of triggering events | 6 years |  |
Redeemable noncontrolling interest redemption value adjustments |  | 4,100,000 |
Redeemable noncontrolling interest paid in-kind |  | 3,300,000 |
Redemption accretion of redeemable preferred noncontrolling interest |  | 800,000 |
Redemption value of redeemable preferred noncontrolling interest |  | $ 192,500,000 |
Subsidiary | Alkali Holdings | Maximum |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |
Redeemable noncontrolling interest preferred commitment | $ 350,000,000 |  |

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